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English definition of “out”

out

adverb, preposition (UNCONSCIOUS)    /aʊt/
unconscious or sleeping: He passes out (= loses consciousness) at the sight of blood. I was hit on the head, and I must have been out cold (= completely unconscious) for about ten minutes.Sleep and sleepingLosing consciousness
(Definition of out adverbpreposition (UNCONSCIOUS) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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