What is an ididom?

Answer 1

Oooh this is my favorite figure of speech. Theyre so fun. Theyre phrases that have a background meaning to them. Ex: that cats out of the bag which means a secret has been let out :)

Answer 2

It seems like there may be a typo in your question. Did you mean to ask about "idiom," which refers to a phrase or expression that has a meaning different from the literal interpretation of the words used?