as blind as a bat

Someone whose vision is very poor, or who is unable to see anything, is (as) blind as a bat.
“Without his glasses, the old man is as blind as a bat.”

as bold as brass

Someone who is as bold as brass has a lot of self-confidence and can act in a way that may seem rude to others.
“He interrupted the meeting and, as bold as brass, queried the veracity of the speaker’s claims.”

as broad as it’s long

This expression means that there is no real difference which alternative is chosen.
“Take the high-speed train, or fly and take a taxi? It’s as broad as it’s long.”

as busy as a bee

If someone is as busy as a bee they are very active and have a lot of things to do.
“Tom is as busy as a bee getting everything ready for the exhibition.”

as clean as a whistle

Something as clean as a whistle is extremely clean.
(This can also mean that a person’s criminal record is clean.)
“Bob spent the afternoon washing and shining his car until it was as clean as a whistle.”

as close / as dumb as an oyster

Someone who is asclose or as dumb as an oyster will never reveal something told in confidence or betray a secret
“Sophie will never repeat what you tell her. She’s as dumb as an oyster.”

as cool as a cucumber

A person who is as cool as a cucumber is not anxious, but relaxed and non-emotional
“The bride’s mother stayed as cool as a cucumber all through the ceremony.”

as crooked as a dog’s hind leg

To say that someone is as crooked as a dog’s hind leg means that they are very dishonest indeed.
“That guy can’t be trusted – he’s as crooked as a dog’s hind leg.”

dead as a dodo

To say that something is (as) dead as a dodo means that it is unquestionably dead or obsolete, or has gone out of fashion.
(A dodo is a bird that is now extinct.)
“The floppy disk is an invention that is now (as) dead as a dodo.”

dead as a doornail

This expression is used to stress that a person or thing is very definitely dead.
“They’ve started fighting again, so the peace agreement is now as dead as a doornail.”

as different as chalk and cheese

Two people who are as different as chalk and cheese are completely different from each other.
“I’m surprised they get on so well. They’re as different as chalk and cheese.”

as different as night and day

Two people or things that are very different from each other are as different as night and day.
“Although they are twins they are as different as night and day.”

as dry as dust

Something that is as dry as dust is very dry indeed.
This expression can also refer to something dull and uninteresting.
“The ground was as dry as dust. / His speech was as dry as dust.”

as dull as ditchwater

Something as dull as ditchwater is very boring.
“The film was as dull as ditchwater. I nearly fell asleep.”

as easy as pie

Something that is (as) easy as pie is very easy to do.
“How did the English test go?” “No problem. It was (as) easy as pie!”

as fit as a fiddle

A person who is as fit as a fiddle is in an excellent state of health or physical condition.
“My grandfather is nearly ninety but he’s as fit as a fiddle. “

as free as a bird

If someone is as free as a bird, they are completely free to do as they please.
“My dad’s very happy – he’s as free as a bird since he retired.”

as fresh as a daisy

Someone who is (as) fresh as a daisy is lively and attractive, in a clean and fresh way.
“I met Molly the other day. She looked as fresh as a daisy.”

as full as a tick

If someone is (as) full as a tick, they have eaten or drunk too much.
“The little boy ate biscuits and drank lemonade until he was as full as a tick.

as good as gold

A child who is as good as gold is obedient and well-behaved.
“Your children are always as good as gold when I look after them.”

as happy as a flea in a doghouse

If someone is (as) happy as a flea in a doghouse, they are very happy and contented.
“Since she moved to a smaller apartment, my mother is as happy as a flea in a doghouse!”

as happy as Larry

If you are (as) happy as Larry, you are very happy indeed.
“My dad’s as happy as Larry at the week-end when we all arrive home.”

as hard as nails

A person who is (as) hard as nails is unsentimental and shows no sympathy.
“Don’t expect any sympathy from him. He’s as hard as nails.”

as keen as mustard

If someone is as keen as mustard, they are very eager, enthusiastic or motivated.
“We should ask Emily to join the team. She’s as keen as mustard.

as mad as a hatter

To say that someone is as mad as a hatter means that they are very strange or insane.
“The old lady next door is as mad as a hatter. She says the strangest things!”

as much use as a handbrake on a canoe

This expression refers to something which is completely useless or serves no purpose.
“With no electricity, a refrigerator would be as much use as a handbrake on a canoe!”

as nice as pie

If a person is as nice as pie, they are surprisingly kind and friendly.
“Surprisingly, after our argument, she was as nice as pie!”

as nutty as a fruitcake

Someone who is (as) nutty as a fruitcake is insane or crazy.
“Don’t pay attention to what the old man says; he’s as nutty as a fruitcake!”

as proud as a peacock

A person who is asproud as a peacock is extremely proud.
“When his son won first prize, Bill was as proud as a peacock.”

proud/pleased as punch

Someone who is as proud or pleased as punch is delighted or feels very satisfied about something.
“Dad was as proud as punch when he won the tennis match.”

as quick as a dog can lick a dish

If you do something surprisingly fast, you do it as quick as a dog can lick a dish.
“He packed his bag as quick as a dog can lick a dish.”

as quiet as a mouse

When someone is as quiet as a mouse, they make no noise at all.
“The burglar was as quiet as a mouse as he moved around the house.”

as scarce as hens’ teeth

To say that something is as scarce as hens’ teeth emphasizes that it is extremely rare, to the point of non-existence.
“Take enough supplies. Water is as scarce as hens’ teeth where you’re going!”

as sharp as a tack

A person who is as sharp as a tack is able to think quickly and learn very fast.
“You won’t have to explain it to him twice. He’s as sharp as a tack.”

as slippery as an eel

To say that someone is as slippery as an eel means that they are difficult to catch and they manage to avoid answering questions.
“The man was as slippery as an eel. He was arrested for theft several times but was never convicted.”

as sly as a fox

Someone who is as sly as a fox is cunning and clever at getting what they want, especially by deceiving or tricking people.
“Be wary of that insurance salesman. He’s as sly as a fox.”

(as) straight as an arrow

Someone who is as straight as an arrow is a morally upright person who is extremely honest.
“You can leave the keys with Andy. He’s as straight as an arrow.”

(as) straight as a ramrod

Someone who is (as) straight as a ramrod is a person who keeps a straight back and looks very serious.
“When my grandfather invited us for dinner, he used to sit straight as a ramrod at the head of the table.”

as thick as thieves

To say that two people are as thick as thieves means that they are very close friends who are very loyal to each other.
“Chris always takes Danny’s side. They’re as thick as thieves.”

as stubborn as a mule

If someone is as stubborn as a mule, they are very obstinate and unwilling to listen to reason or change their mind.
“His friends advised him to accept the offer, but you know Larry – he’s as stubborn as a mule!”

as tough as old boots

If something, specially meat, is (as) tough as old boots, it is hard to cut and difficult to chew.
(This can also refer to a person who is strong either physically or in character.)
“I was served a steak as tough as old boots.”

as ugly as sin

This expression is used to refer to people or things that are considered to be very unattractive.
“Have you seen the new neighbour’s dog? It’s as ugly as sin!”

as ugly as a toad

Someone as ugly as a toad is extremely unattractive.
“The driver was as ugly as a toad but he was very kind and patient.”

as useful as a chocolate teapot

Something which is of no practical use at all is about as useful as a chocolate teapot.
“When there are no roads, a car is about as useful as a chocolate teapot!”

as white as a ghost

A person who is as white as a ghost looks very pale and frightened.
“She went as white as a ghost when she saw the gun.”

like the back of one’s hand

If you know something like the back of your hand, you are very familiar with it and know it in detail.
“Of course I won’t get lost. I know London like the back of my hand!”

like a bat out of hell

If someone or something moves like a bat out of hell, it moves very quickly.
“He grabbed the envelope and ran like a bat out of hell.”

like a bear with a sore head

If someone is behaving like a bear with a sore head, they are very irritable and bad-tempered.
“When his team lost the match, Brad was like a bear with a sore head.”

like bringing a knife to a gunfight

To say that an action was like bringing a knife to a gunfight means that there was a total lack of preparation.
“Asking an inexperienced lawyer to defend such a difficult case was like bringing a knife to a gunfight!”

(sound) like a broken record

Someone who says the same thing again and again is said to sound like a broken record.
“Dad! Stop telling me to be careful when I drive. You sound like a broken record!”

like a cat on hot bricks

A person who is like a cat on hot bricks is very nervous or restless.
“The week before the results were published, she was like a cat on hot bricks.”

like a scalded cat

If something or something moves like a scalded cat, they move very fast, usually because they are frightened or shocked.
“As soon as he saw the policeman, he ran off like a scalded cat.”

like a cat that ate the canary

If, after an achievement or success, a person appears very self-satisfied or pleased with themselves, you can say that they look like the cat that ate the canary.
“When the boss complimented him on his work, Steve looked like the cat that ate the canary.”

like something the cat dragged in

If you compare a person or thing to something the cat dragged in, you think that they look dirty, untidy or generally unappealing.
“My teenage son often looks like something the cat dragged in.”

like cat and dog

Two people who fight or argue like cat and dog frequently have violent arguments, even though they are fond of each other.
“They fight like cat and dog but they’re still together after 30 years.”

like death warmed up

If you look like death warmed up, you look very ill or tired.
“My boss told me to go home. He said I looked like death warmed up.”

like a deer/rabbit caught in the headlights

When you are so surprised that you are momentarily confused or unable to react quickly, you are like a deer (or a rabbit) caught in the headlights.
“Surprised by the journalist’s question, he was like a deer caught in the headlights.”

like a dog with two tails

If someone is like a dog with two tails, they are extremely happy.
“When Paul won the first prize he was like a dog with two tails.”

like greased lightning

If someone or something moves like greased lightning, they move extremely fast.
“As soon as the owner appeared, the boy ran like greased lightning.”

like herding cats

This expression refers to the difficulty of coordinating a situation which involves people who all want to act independently.
“Arranging an outing for a group of people from different countries is like herding cats!”

like a headless chicken

If a person rushes about like a headless chicken, they act in a disorderly way, without thinking or analysing the situation carefully.
“As soon as the store opened, my mother started running around like a headless chicken, eager to find bargains.”

like kicking whales down the beach

This expression is used, especially in computing, to refer to a particularly slow and difficult process.
“Getting him to adopt the new method is like kicking whales down the beach.”

like a moth to a flame

To say that a person is attracted to someone or something like a moth to a flame means that the attraction is so strong they cannot resist.
“He’s drawn to the casino like a moth to a flame.”

like nailing jelly to the wall

To say that something is like nailing jelly to the wall means that it is extremely difficult to do, if not impossible.
“Keeping track of his movements is like nailing jelly to the wall.”

like pouring water into a sieve

If someone spends time or energy trying to do something that is inefficient or useless, it is like pouring water into a sieve.
“Danny’s mother used to say that teaching him good behaviour was like pouring water into a sieve.”

like pulling teeth

Something that is like pulling teeth is extremely difficult to obtain, especially if trying to extract information from someone.
“Getting him to talk about his job was like pulling teeth!”

like a rat up a drainpipe

If someone moves or runs like a rat up a drainpipe, they do it as quickly as possible.
“When the police informer saw a friend, he took off like a rat up a drainpipe.”

like a red flag to a bull

To say that a statement or action is like a red flag to a bull means that it is sure to make someone very angry or upset.
“Don’t mention Tom’s promotion to Mike. It would be like a red flag to a bull!”

like a shot

If you do something like a shot, you do it very quickly, without any hesitation.
“If I won a lot of money on the lotto, I’d leave my job like a shot!”

like a sore thumb

If something sticks out like a sore thumb, it is very obvious or visible in an unpleasant way.
“The modern building sticks out like a sore thumb among the old houses.”

like taking candy from a baby

To say that something is like taking candy from a baby means that it is very easy to do.
“Don’t worry – you’ll manage. It’ll be like taking candy from a baby!”

like taking sand to the beach

Doing something that is unnecessary or of no use at all is said to be like taking sand to the beach.
“Bringing a cake to Judy’s party is like taking sand to the beach; she always uses a caterer.”

like talking to a brick wall

To say that a conversation with someone is like talking to brick wall means that communication is impossible because there is no reaction or response.
“I tried to discuss the problem with him but it was like talking to a brick wall.”

like there’s no tomorrow

If someone does something like there’s no tomorrow, they do it fast and eagerly, regardless of the future, as if this could be their last opportunity to do it.
“I don’t understand him; he’s spending money like there’s no tomorrow.”

like a thief in the night

Someone who acts like a thief in the night does something secretly or in an unexpected manner.
“He left the company like a thief in the night, without telling his colleagues or saying goodbye.”

like a ton of bricks

If somebody comes down on you like a ton of bricks, they criticize you severely because you have done something wrong.
“If you don’t follow his instructions carefully, he’ll come down on you like a ton of bricks!”

like turkeys voting for Christmas

This expression is used to say that a particular option is unlikely to be chosen because it would not be in the interest of the people concerned.
(In many countries people eat turkey at Christmas.)
“Expecting them to accept a decrease in salary would be like turkeys voting for Christmas.”

like two peas in a pod

Two people who are like two peas in a pod are very similar in appearance.
“The two brothers are very alike – they’re like two peas in a pod!”

like water off a duck’s back

Criticism, advice or comments which have no effect on someone are said to be ‘like water off a duck’s back‘.
“He’s been warned of the dangers of smoking but it’s like water off a duck’s back.”

like (putting) lipstick on  a pig

This expression means that to ‘dress up’ something unappealing or ugly, in a vain attempt to make it look better, is like putting lipstick on a pig.
“Flowers on that ugly old bridge would be (like putting) lipstick on a pig!”

like wildfire

If something such as news, rumours or gossip spreads like wildfire, it becomes widely known very fast.
“As soon as the nomination was announced, the news spread like wildfire.”

much of a muchness

This expession means ‘very similar’ or ‘almost alike’.
“It’s hard to choose between the two – they’re much of a muchness really.”

(not) cut from the same cloth

If two people are cut from the same cloth, they are very similar in character or behaviour.
“Although the brothers look alike, they are not cut from the same cloth. They each have their own personality.”

not a patch on

If something or someone is not a patch on an other, they are not nearly as good.
“His second conference was not a patch on the first one.”

not in the same league as

If something is not in the same league, it is of much lower standard than something else.
“He had a good voice but he wasn’t in the same league as Pavarotti.”

not up to par

If something is not up to par, it does not meet the required standard.
“He didn’t get the job because his English was not up to par.”

a world of difference

When comparing two things or situations, the expression a world of difference means that there is a vast difference between them.
“A swimming pool would make a world of difference in this climate.”

worlds apart

When two people are very different, they are said to be worlds apart.
“As regards our political opinions, we’re worlds apart.”