Idioms 1
Idioms 2
Idioms 3
Idioms 4
Idioms 5
100

It's raining cats and dogs

it's raining a lot.
100

That was a piece of cake.

That was easy.

100
I feel under the weather. 

I don't feel good.

100

I have butterflies in my stomach. 

I'm nervous.

200

Break a leg 

Good Luck! 

200

Don't spill the beans.

Don't tell my secret.

200

When pigs fly.

That is not going to happen.

200

The ship has sailed

You missed your chance

300

To Lighten Up

To cheer up, to calm down 

300

I'm going to hit the sack.

I'm going to bed and sleep.
300

That costs an arm and a leg.

That costs a lot of money.  It's expensive.
300
Couch Potato 

Doing very little, being very lazy

400

Call it a day

To end something, stop doing something

400

On pins and needles

Nervous

400

To find a needle in a haystack 

Something that is very hard to find

400

Hang in there

Don't give up

500

Blow off steam or let off steam

to do or say something to get rid of strong emotions

500

We don't see eye to eye.

We don't agree.

500

Go back to the drawing board

To start over
500

The last straw. 

The last chance