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

 

knock out

 phrasal verb
phrasal verb
 
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Phrasal Verbs

    knock somebodyout

     
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  1. 1to make someone fall asleep or become unconscious The blow knocked her out.
  2. 2(in boxing) to hit an opponent so that they cannot get up within a limited time and therefore lose the fight related noun knockout
  3. 3(informal) to surprise and impress someone very much The movie just knocked me out. related noun knockout

knock somebody/yourself out

 
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to make someone/yourself very tired synonym wear yourself/somebody out

knock somebodyout (of something)

 
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to defeat someone so that they cannot continue competing synonym eliminate The White Sox had been knocked out of the World Series. see knockout

knock somethingout

(informal)
 
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to produce something, especially quickly and easily He knocks out five books a year.
See knock out in the Oxford Advanced Learner's Dictionary