informal Stop doing something.
- Danielle, knock it off. The overprotective mother role doesn't suit you.
- The couple who are renting the place next to mine spent the entire night fighting. They didn't knock it off until well past two in the morning.
- If you're doing this as an attempt to Henry make break off his engagement with his fianceé, knock it off, because it ain't gonna happen!
informal cut it out, give it a rest, leave off, pack it in, lay off, quit
British informal give over
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