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Reference : Slang : K : knock off (2)

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knock off (2)

Meaning: to kill someone, to murder someone

For example:

  • If you knock someone off in the U.S.A, you could get capital punishment and die in the electric chair or by lethal injection.

  • Truman Capote's great novel "In Cold Blood" is about two young guys who knock off a whole family in their home while trying to rob them.

Note: The phrasal verb "knock off" can take a subject between the verb and the preposition, as in "to knock somebody off", or it can take a subject after the preposition, as in "to knock off somebody".

Quick Quiz:

The woman who lived next door knocked her husband off by
  1. cooking his dinner
  2. poisoning his dinner
  3. nagging him to death