Definitions from Wiktionary (knock off)

▸ verb:  (ambitransitive, slang) To halt one's work or other activity.
▸ verb:  (transitive, slang) To kill.
▸ verb:  (sports, by extension) To defeat.
▸ verb:  (transitive) To remove, as a discount or estimate.
▸ verb:  (transitive, slang) To rob.
▸ verb:  (transitive) To make a copy of, as of a design.
▸ verb:  (transitive) To assign (an item) to a bidder at an auction, indicated by knocking on the counter.
▸ verb:  (transitive, slang, vulgar, British) To have sex with (a woman).
▸ verb:  (transitive, informal) To accomplish hastily.
▸ verb:  To remove (something or someone) by hitting.
▸ noun:  Nonstandard form of knockoff. [(often attributive) An imitation of something, particularly a well-known product, usually of lower quality and price than the original.]
▸ Also see knock_off

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