knock out

verb

To strike or bump (someone or something) out. (transitive) · I accidentally knocked out the glass in my picture frame.
To render unconscious, as by a blow to the head. (transitive) · The boxer knocked out his opponent in the third round.
To put to sleep. (informal, transitive) · The allergy pill knocked him out for a good three hours.
To fall asleep, especially suddenly. (informal, intransitive)
To exhaust. (informal, transitive) · Running errands all day really knocked him out.
To impress, surpass or overwhelm (someone). (informal, transitive)
To defeat or kill (someone). (slang, transitive)
To cause a mechanism to become non-functional by damaging or destroying it. (transitive) · The antitank gun knocked out the enemy tank.

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