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beat up (v.)

"thrash, strike repeatedly," c. 1900 (v.), from beat (v.) + up (adv.). Earlier it meant "summon (recruits, etc.) by the beating of a drum" (1690s). Beat-up as an adjectival phrase meaning "worn-out" dates to 1946.

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Definitions of beat up from WordNet

beat up (v.)
gather;
Synonyms: drum up / rally
beat up (v.)
give a beating to; subject to a beating, either as a punishment or as an act of aggression;
Synonyms: beat / work over
From wordnet.princeton.edu