n 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.
n The deactivation of anything.
n (informal) Something wildly popular, entertaining, or funny.
n (informal) A very attractive person, especially a beautiful woman.
n A partially punched opening meant for optional later removal.
n (genetics) The deactivation of a particular gene.
n (genetics) A creature engineered with a particular gene deactivated.
n (printing) An event where a foreground color causes a background color not to print.
n (sports) A tournament in which a team or player must beat the opponent in order to progress to the next round.
n (uncountable) A simple game for two or more players, derived from basketball.
adj Rendering someone unconscious.
adj Amazing; gorgeous; beautiful.
adj (genetics) Designating an organism in which a particular gene has been removed or deactivated.
adj Causing elimination from a competition.
n Short for knockout auction. [An auction where most of the bidders are secretly shills.]