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

knock out

phrasal verb
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knock somebody out
  1. to make somebody go to sleep or become unconscious
    • The blow knocked her out.
  2. (in boxing) to hit an opponent so that they cannot get up within a limited time and therefore lose the fight related noun knockoutTopics Health problemsc1
  3. (informal) to surprise and impress somebody very much
    • The movie just knocked me out.
    related noun knockout
knock somebody/yourself out
  1. to make somebody/yourself very tired synonym wear out
    • Why knock yourself out for little income?
knock somebody out (of something)
  1. to defeat somebody so that they cannot continue competing synonym eliminate
    • England had been knocked out of the World Cup.
    see also knockout
knock something out
  1. (informal) to produce something, especially quickly and easily
    • He knocks out five books a year.
knock yourself out
  1. (informal) to go ahead and do what you want
    • You guys go and have fun. Knock yourselves out.
    • If you like something and can afford it, I say knock yourself out.
See knock out in the Oxford Advanced American Dictionary
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