KNOCKOUT
hard, knockout, severe
(adjective) very strong or vigorous; “strong winds”; “a hard left to the chin”; “a knockout punch”; “a severe blow”
knockout, KO, kayo
(noun) a blow that renders the opponent unconscious
smasher, stunner, knockout, beauty, ravisher, sweetheart, peach, lulu, looker, mantrap, dish
(noun) a very attractive or seductive looking woman
Source: WordNet® 3.1
Etymology
Noun
knockout (plural knockouts)
The act of making someone unconscious, or at least unable to come back on their 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.
A knockout auction.
Adjective
knockout (not comparable)
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
Source: Wiktionary
Knock"-out`, n.
Definition: Act of knocking out, or state of being knocked out.
Knock"-out`, a.
Definition: That knocks out; characterized by knocking out; as, a knock-out
blow; a knock-out key for knocking out a drill from a collet.
Source: Webster’s Unabridged Dictionary 1913 Edition