Knock it off!

knock it off

slang To stop doing whatever one is doing. Often used as an imperative. Knock it off, you two! I don't want to see any more fighting. I'm going to go tell those kids to knock it off with the loud music. I know you don't think anyone notices when you come in late, but if you don't knock it off, you're going to find yourself on the unemployment line.
See also: knock, off
Farlex Dictionary of Idioms.

Knock it off!

Inf. Be quiet!; Stop that noise! Stop doing that! John: Hey, you guys! Knock it off! Bob: Sorry. Bill: Sorry. I guess we got a little carried away. Sue: All right. Knock it off! Bill: Yeah. Let's get down to business.
See also: knock
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

knock it ˈoff!

(spoken) used to tell somebody to stop making a noise, annoying you, etc: Knock it off, will you? I’m trying to work.
See also: knock
Farlex Partner Idioms Dictionary

Knock it off!

exclam. Be Quiet!; Shut up! Hey, you guys! Knock it off!
See also: knock
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • knock it off
  • knock off
  • if you're in a hole, stop digging
  • enough
  • Enough already!
  • What does (someone) think (someone) is doing?
  • be on the edge of (something)
  • teeter
  • teeter on the brink/edge of something
  • teeter on the edge of (something)