knock outRate this phrase:(4.00 / 2 votes)Say it
To put someone to sleep.

The allergy pill knocked him out for a good three hours.

Additional definitions for 'knock out':

knock outTo strike or bump someone or something out.
knock outTo render someone unconscious, as by a blow to the head.
knock outTo exhaust a personal or animal.
knock outTo complete, especially in haste; knock off.
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"knock out." Phrases.net. STANDS4 LLC, 2017. Web. 19 Nov. 2017. <http://www.phrases.net/phrase/knock-out_842>.

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