idiom 2

A bear with a sore head

Irritated / bad mood

A dark horse

A person with hidden abilities

A dog's life

A difficult, hard life

A fish out of water

Somebody who feels uncomfortable

A night owl

Person who enjoys staying up late

A red rag to a bull

Action, comment, etc. liable to provoke somebody

A sitting duck

An easy target

A wild-goose chase

A hopeless search

Bark up the wrong tree

Have a false idea about something

Be as busy as a bee

Very busy

Be in the doghouse

Be out of favour, in trouble

Be in the same boat

Be in the same (usually bad) situation

Crocodile tears

False tears

Dog eat dog

Ruthless competition, rivalry

Fight like cat and dog

Disagree violently

Flog a dead horse

Waste time doing something useless

Fly on the wall

See or hear something without being involved

Have a bee in one's bonnet

Have an obsession about something

Have a frog in one's throat

Inability to speak due to nervousness

Have kittens

Be nervous or anxious about something

Let sleeping dogs lie

Avoid mentioning a subject that could cause trouble

Let the cat out of the bag

Reveal a secret

Like a bull in a china shop

Behave in a clumsy or awkward way

Like water off a duck's back

Having no effect

No room to swing a cat

No room at all

Not count one's chickens before they're hatched

Not assume something before it happens

Play cat and mouse with somebody

Treat somebody alternatively cruelly and kindly

Plenty more fish in the sea

Many more opportunities in life for love

Put the cat among the pigeons

Cause trouble or controversy

Rain cats and dogs

Rain heavily

A red-letter day

A very important day

Achilles heel

Weakest point of somebody's character

Be all fingers and thumbs

Be awkward, clumsy

Be beside oneself with anger

To be extremely angry

Be caught red-handed

Be caught while committing a crime

Be full of beans

Be very lively

Be green

Be inexperienced

Be in somebody's black books

Out of favour

Be in somebody's shoes

Be in somebody's position

Be in two minds about something

Not be able to decide what to do

Be the apple of somebody's eye

Be very precious to somebody

Be the perfect image of somebody

Look exactly like somebody

Be the splitting image of somebody

Look exactly like somebody

Be tickled pink

Be really pleased

Be up in arms

Be very angry

Be/get soaked to the skin

Be or get very wet

Beat somebody black and blue

Hit somebody repeatedly until bruised

Big-headed

Conceited; boastful

Bite off more than somebody can chew

Try to do something which is too difficult

Black and blue all over

Covered with bruises

Black tie

Formal clothing

Blow a fuse

Become very angry

Blue-eyed boy

A favoured person

Bury one's head in the sand

Avoid or ignore reality or responsibility

Cut somebody to the quick

Deeply hurt somebody's feelings

Cut to the bone

Reduced to the minimum

Eat one's heart out

Feel jealous or sad about something

Fall head over heels

Fall in love quickly

Feel in one's bones

Feeling something instinctively

Feel one's ears burning

Have a feeling that somebody is talking about you

Fly off the handle

Quickly become very angry

Get a bit hot under the collar

Get angry, upset or embarrassed

Get a problem off one's chest

Tell somebody else about your problem

Get cold feet

Lose courage to do something / Be nervous

Get off on the wrong foot

Argue or disagree at the beginning

Get out of bed on the wrong side

Be in a bad mood

Get the wrong end of the stick

Misunderstand completely

Get your own back

Take or get revenge

Grease somebody's palm

Bribe somebody

Green with envy

Very jealous

Grey matter

Brains; intelligence

Have a sharp tongue

Tend to say unkind or hurtful things

Have a yellow streak

Be a coward

Have an early night

Go to bed early

Have an eye for

Be a good judge of something

Have at one's fingertips

Have easily available

Have butterflies in one's stomach

Be very nervous about something

Have one's heart in one's mouth

Be extremely anxious about something

Have somebody's hands full

Be very busy with something

Have the cheek

Dare to do something

Have the gift of the gab

Be able to talk well

Have time on one's hands

Have free time

In black and white

In writing

In the black

Not owing anybody any money

In the flesh

In person

In the red

Owe money to a bank

Keep a straight face

Manage to look serious

Keep an eye on something

Guard or protect something

Keep one's chin up

Not be discouraged

Keep one's fingers crossed

Hope that something will turn out well

Keep one's wits about one

Be alert and able to deal with difficulties

Keep something under one's hat

Keep something secret

Lend an ear

Listen to somebody in a sympathetic way

Lend somebody a hand

Give help to somebody

Like the back of one's hand

Be very familiar with something

Look down one's nose at somebody

Feel or act superior to somebody