beat up phrasal verb ( see also ↑ beat )
1 . beat somebody ↔ up to hurt someone badly by hitting them:
Her boyfriend got drunk and beat her up.
2 . beat up on somebody American English to hit someone and harm them, especially someone younger or weaker than yourself
3 . beat yourself up ( also beat up on yourself American English ) informal to blame yourself too much for something:
If you do your best and you lose, you can’t beat yourself up about it.