Definition of beat up phrasal verb from the Oxford Advanced American Dictionary

 

beat up

 phrasal verb
phrasal verb
 
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Phrasal Verbs

beat yourself up (about/over something)

(also beat up on yourself (about/over something))(informal)
 
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to blame yourself too much for something Look, there's no need to beat yourself up over this.
See the Oxford Advanced Learner's Dictionary entry: beat up