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100

Once in a blue moon 

Something that happens very rarely

100

 Let the cat out of the bag

Reveal a secret unintentionally

100

Cost an arm and a leg

Very expensive 

100

A piece of cake 

Very easy 

200

Eat your words

Admit you were wrong about something

200

Pull someone's leg

To joke or tease someone

200

On the fence

Undecided about something

200

Bite the bullet

To face something difficult or unpleasant with courage

300

Hit the hay 

Go to bed

300

Burn the midnight oil 

Work late into the night

300

Break the ice

Start a conversation in a socially awkward situation

300

Catch some Z’s 

To sleep 

400

A blessing in disguise

Something that seems bad at first but turns out to be good.

400

Throw in the towel

To give up or admit defeat.

400

 Hit the nail on the head 

Get something exactly right.

400

The ball is in your court

It’s your turn to take action

500

Kick the bucket 

To die

500

Blow off steam 

Release pent-up emotions or energy.

500

Bark up the wrong tree

Pursue the wrong course of action or blame the wrong person.

500

Caught red-handed

Caught in the act of doing something wrong.