knock sb out Definition in the Cambridge English Dictionary
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Definition of “knock sb out” - English Dictionary

Definition of "knock sb out" - British English Dictionary

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knock sb out

phrasal verb with knock uk   /nɒk/  us   /nɑːk/ verb

knock sb out (MAKE UNCONSCIOUS)

B2 to ​hit someone so that they ​becomeunconscious: His ​opponentknocked him out with one ​punch.
See also

knock sb out (MAKE SLEEP)

If a ​drug or ​alcoholknocks you out, it makes you go to ​sleep: The ​sleepingtabletsknocked him out for 18 ​hours.

knock sb out (DEFEAT)

B2 to ​defeat a ​person or a ​team in a ​competition so that they can no ​longer take ​part in it: The ​champion was ​unexpectedlyknocked out (of the ​tournament) in the first round.

knock sb out (IMPRESS)

old-fashioned slang to ​causeenjoyment or ​admiration in someone: We were all really ​knocked out by the ​film.
(Definition of knock sb out from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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“knock sb out” in English

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