Definition of knock out phrasal verb from the Oxford Advanced Learner's Dictionary

  

knock out

 phrasal verb
phrasal verb Injuries
 
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Phrasal Verbs
  1. 1  to make somebody fall asleep or become unconscious The blow knocked her out. See related entries: Injuries
  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 See related entries: Injuries
  3. 3(informal) to surprise and impress somebody very much The movie just knocked me out. related noun knockout See related entries: Injuries

knock somebody out

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knock yourself out

 
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to make somebody/yourself very tired synonym wear out

knock somebodyout (of something)

 
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to defeat somebody so that they cannot continue competing synonym eliminate England had been knocked out of the World Cup. see also knockout
(informal) to produce something, especially quickly and easily He knocks out five books a year.