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English definition of “do sb in”

do sb in

(KILL) slang phrasal verb with do     // /du/ /duː/ /duː/ verb (did, done)
to attack or kill someone: They threatened to do me in if I didn't pay up by Friday.Murder and attempted murderKillingPhysical and sexual assault and abductionSexual activity in general
(Definition of do sb in (KILL) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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