Princeton's WordNet

1. neutralize, neutralise, liquidate, waste, knock off, do in(verb)

   get rid of (someone who may be a threat) by killing

   "The mafia liquidated the informer"; "the double agent was neutralized"

2. shave, knock off(verb)

   cut the price of

3. hook, snitch, thieve, cop, knock off, glom(verb)

   take by theft

   "Someone snitched my wallet!"

4. dash off, scratch off, knock off, toss off, fling off(verb)

   write quickly

   "She dashed off a note to her husband saying she would not be home for supper"; "He scratched off a thank-you note to the hostess"

5. drop, knock off(verb)

   stop pursuing or acting

   "drop a lawsuit"; "knock it off!"

Kernerman English Learner's Dictionary

1. knock off(verb)ˈɑɑk

   to deduct an amount from a price

   We'll knock $50 off the price.

Wiktionary

1. knock off(Noun)

   An imitation, especially one of poorer quality.

2. knock off(Verb)

   To bump or hit so that something falls off

3. knock off(Verb)

   To quit; stop doing work or other activity. The term originated from the practice aboard slave galleys to have a man beat time for the rowers by knocking on a block or drum; when he stopped, the rowers could rest.

4. knock off(Verb)

   To kill someone

5. knock off(Verb)

   To reduce or remove

6. knock off(Verb)

   To steal.

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