make fun of
Definition from Wiktionary, the free dictionary
Recorded 1737. Preserves the older meaning of fun, from Middle English fon, fonne (“foolish, simple, silly”), fun (c. 1700) meaning "a cheat, trick, hoax", from a verb fun meaning "to cheat, trick" (1680s).
- (idiomatic, informal) To tease, ridicule or make jokes about, generally in a pejorative manner.
- Please stop making fun of your sister and just help her!