dish on (someone or something)
slang To gossip about someone or something. Those popular girls are always dishing on someone in our class.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
dish on someone
Sl. to gossip about or slander someone. Stop dishing on her. She never hurt you! They spent an hour dishing on Wally.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.