Entry 7 senses · 2 variants Webster, 1913 knock off /näk ôf/ · IPA n. v. i. & t. 01 n. a device in a knitting machine to remove loops from the needles. 1. a device in a knitting machine to remove loops from the needles. 02 v. i. & t. to quit (working). 1. to quit (working). 2. to accomplish; -- frequently used when the task is accomplished rapidly. 3. to kill; to defeat (opponents).[Colloq.] 4. to discount, to deduct (a sum from a price). 5. to rob. 6. to make a knockoff of; to copy or imitate, usually without permission or admission of copying. Syn. knock over.