Definition of knock off phrasal verb from the Oxford Advanced American Dictionary

 

knock off

 phrasal verb
phrasal verb
 
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Phrasal Verbs

knock off

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knock off something

(informal)
 
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to stop doing something, especially work Do you want to knock off early today? What time do you knock off work?

knock somebodyoff

(slang)
 
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to murder someone

knock somethingoff

(informal)
 
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to complete something quickly and without much effort He knocks off three novels a year.

knock somethingoff

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knock somethingoff something

 
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to reduce the price or value of something They knocked off $60 because of a scratch. The news knocked 13% off the company's shares.
See the Oxford Advanced Learner's Dictionary entry: knock off