knock out

To strike or bump (someone or something) out.
To render unconscious, as by a blow to the head.
To put to sleep.
To fall asleep, especially suddenly.
To exhaust.
To complete, especially in haste; knock off.
To cause a mechanism to become non-functional by damaging or destroying it.
To eliminate.
To communicate (a message) by knocking.
To lose the scent of hounds in fox-hunting.
To leave college after hours—after half-past ten at night when the doors has been locked.

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