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English definition of “do someone in”

do someone in

infml
verb phrasal verb with do  /du/ ( present tense does  /dʌz, dəz/, past tense did  /dɪd/, past participle done  /dʌn/) us  

(CAUSE TO FAIL)

to be the cause of someone's failure: A couple of key losses did the team in.
(Definition of do someone in phrasal verb, verb from the Cambridge Academic Content Dictionary © Cambridge University Press)
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