Knock-off, n.
  1. Act or place of knocking off; that which knocks off; specif. Mach., a cam or the like for disconnecting something, as a device in a knitting machine to remove loops from the needles.
  Knock-off, a. That knocks off; of or pertaining to knocking off.
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  knockoff
       n : an unauthorized copy or imitation [syn: clone]