Idioms 1
Idioms 2
Idioms 3
100

It's raining cats and dogs

it's raining a lot.
100

What is, "Keep a Straight Face".

This idioms means, to try not to smile or laugh.

100

to burst into tears 

This idioms means  to suddenly start to cry.  

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.

300

I have butterflies in my stomach. 

I'm nervous.

300

He was on pins and needles waiting for his grades.

He is worried about his grades.

300

What is "to run across".

This idioms means, to meet someone unexpectedly.

400

That was a piece of cake.

That was easy.

400

Break down.

to fail, stop working properly

400

That costs an arm and a leg.

That costs a lot of money.  It's expensive.