knock sb out Definition in British English Dictionary
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Definition of "knock sb out" - British English Dictionary

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knock sb out

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

(MAKE UNCONSCIOUS)

B2 to hit someone so that they become unconscious: His opponent knocked him out with one punch.
See also

(MAKE SLEEP)

If a drug or alcohol knocks you out, it makes you go to sleep: The sleeping tablets knocked him out for 18 hours.

(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 unexpectedly knocked out (of the tournament) in the first round.

(IMPRESS)

old-fashioned slang to cause enjoyment 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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