Beat is a versatile word in English with multiple meanings:
1. As a verb: to hit repeatedly ("beat the drum"), to defeat ("beat the opponent"), or to mix vigorously ("beat the eggs")
2. As a noun: a regular rhythm in music ("the song has a great beat"), an area regularly patrolled by police ("officer's beat"), or the main emphasis in poetry ("iambic beat")
3. As an adjective: extremely tired ("I'm beat after work")
4. In slang: awesome or cool ("That new song is beat!")