Meaning of “knock sb off” in the English Dictionary

"knock sb off" in British English

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knock sb off

phrasal verb with knock uk /nɒk/ us /nɑːk/ verb

(MURDER)

slang to murder someone:

(HAVE SEX)

offensive old-fashioned to have sex with someone

(Definition of “knock sb off” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)