A figure of speech is the use of a word or a phrase to explain an idea more clearly or interestingly. It is sometimes called a rethorical figure.
I will give you some examples in the picture below. Click it and you will find hyperlinks in the picture that leads you to some information about the figures of speech and some examples. You need to ha an account to be able to work with it. The account is free. In school I log in so you can use it on the SmartBoard.
If you want to learn some more figures of speech you will find some more here.
Vill du läsa mer om bildspråk eller retoriska figurer på svenska kan du läsa mer här.