keep mouth shut

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!"
See also: keep, mouth, shut
Farlex Dictionary of Idioms.

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.
See also: keep, mouth, shut
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • keep (one's) mouth shut
  • keep one's mouth shut
  • Keep your mouth shut
  • beam in (one's) eye
  • a beam in your eye
  • find fault
  • find fault with (someone or something)
  • generous to a fault
  • open book
  • an open book