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knockoff

or knock-off

[nok-awf, -of]
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noun
  1. an act or instance of knocking off.
  2. an unlicensed copy of something, especially fashion clothing, intended to be sold at a lower price than the original.
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Origin of knockoff

First recorded in 1870–75, for an earlier sense; noun use of verb phrase knock off
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Word Origin and History for knockoff

n.

"cheap imitation," 1966, from the verbal phrase knock off "do hastily;" in reference to the casual way the things are made.

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Online Etymology Dictionary, © 2010 Douglas Harper