Definitions
1.verbTo strike or bump (someone or something) out."I accidentally knocked out the glass in my picture frame."
2.verbTo render unconscious, as by a blow to the head."The boxer knocked out his opponent in the third round."
3.verbTo put to sleep."The allergy pill knocked him out for a good three hours."
4.verbTo exhaust."Running errands all day really knocked him out."
5.verbTo complete, especially in haste; knock off."They knocked out the entire project in one night."
6.verbTo cause a mechanism to become non-functional by damaging or destroying it."The antitank gun knocked out the enemy tank."
7.verbTo eliminate.
8.verbTo communicate (a message) by knocking."The prisoner knocked out a message on the wall for the prisoner in the adjoining cell."
9.verbTo lose the scent of hounds in fox-hunting.
10.verb(Oxford University slang) To leave college after hours—after half-past ten at night when the doors has been locked.