Definitions for knockoutˈnɒkˌaʊt

knock•outˈnɒkˌaʊt(n.)

an act or instance of knocking out.
the state or fact of being knocked out.
a knockout blow.
Informal. a person or thing overwhelmingly attractive, appealing, or successful.
Category: Informal
(adj.)serving to knock out:
the knockout punch.

1810–20

smasher, stunner, knockout, beauty, ravisher, sweetheart, peach, lulu, looker, mantrap, dish(noun)
a very attractive or seductive looking woman
knockout, KO, kayo(adj)
a blow that renders the opponent unconscious
hard, knockout, severe(adj)
very strong or vigorous
"strong winds"; "a hard left to the chin"; "a knockout punch"; "a severe blow"

knockout(Noun)
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 boxer scored a knockout on his opponent.
knockout(Noun)
Something wildly popular, entertaining, or funny.
If you've ever had a sack race, you know it's a real knockout for kids and adults alike.
knockout(Noun)
A very attractive person, especially a beautiful woman.
knockout(Noun)
A partially punched opening meant for optional later removal.
They left a knockout in the panel for running extra wires someday.
knockout(Noun)
The deactivation of a particular gene.
knockout(Noun)
A creature engineered with a particular gene deactivated.
knockout(Noun)
An event where a foreground color causes a background color not to print.
knockout(Noun)
A tournament, in which a team or player must beat the opponent in order to progress to the next round.
the knockout stages of the competition
knockout(Adjective)
Rendering someone unconscious.
He delivered a knockout blow.
knockout(Adjective)
Amazing; gorgeous; beautiful.
You should have seen her knockout eyes.
knockout(Adjective)
Designating an organism in which a particular gene has been removed or deactivated.

Origin: From knock out.

Citation

"knockout." Definitions.net. STANDS4 LLC, 2013. Web. 23 May 2013. <http://www.definitions.net/definition/knockout>.