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knock off (sth)

informal phrasal verb with knock
 
/nɒk/
 
US  /nɑːk/ verb

Definition

to stop working, usually at the end of the day: I don't knock off until six. What time do you knock off work?Causing something to endComing to an end
(Definition of knock off (sth) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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