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100

Break a leg

to wish someone good luck

100

Not my cup of tea

not something one likes or is interested in

100

In a pickle

in a difficult situation

100

Piece of cake

it's easy


100

It costs an arm and a leg

it's expensive
200

Kick the bucket

to die

200
The elephant in the room

an obvious, important, and often uncomfortable issue that people are avoiding discussing or acknowledging

200
Face the music

to accept criticism or punishment for something you have done

200
Beat around the bush

 avoiding an important topic or not speaking directly about something

200
Once a blue moon

rarely

300

By the skin of your teeth

to just barely get by or make it

300

When pigs fly

to express when something is impossible to happen
300

Hit the sack/hay

to go to bed

300

Back to the drawing board

to start from the beginning again
300

A bad egg

a bad person

400

Barking up the wrong tree

trying to do something in a way that will not work

400

Add insult to injury

when a bad situation becomes worse

400

Don't cry over spilt milk

Don't be upset about something you can't change

400

We don't see eye to eye

don't agree with someone

400

Beat a dead horse

to waste effort on something when there is no chance of succeeding

500
It's swings and roundabouts

the positive and negative results of a situation or action balance each other

500

a bit of a dark horse

a person with hidden abilities

500

A drop in the bucket

something small and unimportant, esp. when compared with something else

500

Play it by ear

to decide what to do or say as a situation unfolds, rather than acting according to a pre-made plan or preparation

500

Let sleeping dogs lie

said to warn someone that they should not talk about a bad situation that most people have forgotten about