v.1. To be rough or brutal with someone; mistreat someone: When he got drunk, he would knock me around. They were in a small boat, and the waves really knocked them around.
2. To wander from place to place in some area: I spent my summer knocking around Europe.
3. To discuss or consider something: We met to knock around some ideas. I'm not sure of this proposal—let's knock it around for a few days.