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. [ Webster 1913 Suppl. ]
2. A knockoff. [ PJC ]
a. That knocks off; of or pertaining to knocking off. [ Webster 1913 Suppl. ]