knockout

IPA: nˈɑkaʊt

The act of making one unconscious, or at least unable to come back on one's feet within a certain period of time; a TKO.
The deactivation of anything.
(informal) Something wildly popular, entertaining, or funny.
(informal) A very attractive person, especially a beautiful woman.
A partially punched opening meant for optional later removal.
(genetics) The deactivation of a particular gene.
(genetics) A creature engineered with a particular gene deactivated.
(printing) An event where a foreground color causes a background color not to print.
(sports) A tournament in which a team or player must beat the opponent in order to progress to the next round.
(uncountable) A simple game for two or more players, derived from basketball.
Short for knockout auction. [An auction where most of the bidders are secretly shills.]

Rendering someone unconscious.
Amazing; gorgeous; beautiful.
(genetics) Designating an organism in which a particular gene has been removed or deactivated.
Causing elimination from a competition.

knock out

IPA: nˈɑkˈaʊt

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

IPA: nˈɑkˈaʊt

Alternative form of knockout [The act of making one unconscious, or at least unable to come back on one's feet within a certain period of time; a TKO.]