keep mouth shut
Also found in: Dictionary, Thesaurus, Medical, Encyclopedia.
keep (one's) mouth shut
To not discuss or mention something. He needs to keep his mouth shut and stop telling our family secrets to everyone in town! A: "It wasn't my fault. Brian said—" B: "Keep your mouth shut, Chad!"
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
keep one's mouth shut (about someone or something)
Fig. to keep quiet about someone or something; to keep a secret about someone or something. They told me to keep my mouth shut about the boss or I'd be in big trouble. I think I'll keep my mouth shut.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.