General:
* Beat it: Go away! Leave!
* Beat around the bush: To avoid talking directly about something.
* Beat the odds: To succeed despite unfavorable circumstances.
* Beat a hasty retreat: To leave quickly, often in fear or defeat.
* Beat someone to the punch: To do something before someone else.
In regards to competition:
* Beat the competition: To be better than your rivals.
* Beat someone hands down: To defeat someone easily.
* Beat someone at their own game: To outsmart someone by using their own methods against them.
Other:
* Beat up: To physically attack someone.
* Beat up on: To bully or harass someone.
* Beat a dead horse: To argue about something that is settled or pointless.
* Beat the clock: To complete a task before a deadline.
The specific meaning of "beat" in an idiom depends on the context and the other words used.