Shut your mouth!

Related to Shut your mouth!: Mouth ulcer

shut (one's) mouth

1. To do something in order to keep someone from speaking about something, especially a secret or damaging piece of information. The company tried to bribe me with a cash payout in order to shut my mouth, but there was nothing that would stop me from talking about the illegal things I'd seen while working there. We've got to find a way to shut her mouth; her testimony could bring down our entire organization.
2. To choose not to speak, especially to be tactful, to keep a secret, or to stop irritating someone. I could tell my encouragement wasn't helping, so I just shut my mouth. I'm going to shut my mouth before I say something I'm not supposed to! Tim, if you don't shut your mouth, I'm going to come over there and shut it for you.
See also: mouth, shut
Farlex Dictionary of Idioms.

shut your ˈmouth/ˈtrap/ˈface/ˈgob!

(also keep your ˈmouth/ˈtrap shut) (slang) a rude way of telling somebody to be quiet or stop talking: ‘Shut your face’, Roger said, ‘or I’ll kick you out.’ Why can’t you learn to keep your big mouth shut?
Trap and gob are slang words for ‘mouth’.
See also: face, mouth, shut, trap
Farlex Partner Idioms Dictionary

Shut your mouth!

verb
See Shut your face!
See also: shut
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • (someone or something) promises well
  • a fast talker
  • a/the feel of (something)
  • a thing of the past
  • a necessary evil
  • (I) wouldn't (do something) if I were you
  • (have) got something going (with someone)
  • a horse of another
  • a horse of another color
  • a horse of another colour