idioms

Hi there!
Today,I want to say about idioms.Proverb is the phrase that the long time a go people said and use now.Example:

1.cool as cucumber=very calm
2.a piece of cake=very easy
3.don't cry over spilt milk=when you have an accident,just fix a damage
4.break a leg=good luck

since you already know,I want to give you questions.say what an idiom and idiom mean by a picture


1.

break a leg:)