Do you have any topic in mind? English has a lot of slang it’s hard to make a list of all of it edit: are you asking for a definition of the word “expression”? Or examples of common expressions (phrases)?
Are you asking what contexts “expression” can be used in? Here are some: 1. “expression” meaning “saying” , “idiom”, “slang” etc. 2. “expression” meaning emotion on someone’s face, smiling, frowning, etc. 3. artistic/ emotional expression of the self or something, “expressing yourself through art”
In general, expression is the act of communication through any form