Definition of "knockout" in English

noun

1. 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 boxer scored a knockout on his opponent.

2. The deactivation of anything.

3. (informal) 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.

4. (informal) A very attractive person, especially a beautiful woman.

5. A partially punched opening meant for optional later removal.

   • They left a knockout in the panel for running extra wires someday.

6. (genetics) The deactivation of a particular gene.

7. (genetics) A creature engineered with a particular gene deactivated.

8. (printing) An event where a foreground color causes a background color not to print.

9. (sports) 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

10. (uncountable) A simple game for two or more players, derived from basketball.

11. (US, professional wrestling, capitalized) A woman in Total Nonstop Action Wrestling.

12. Ellipsis of knockout auction.

adjective

1. Rendering someone unconscious.

   • He delivered a knockout blow.

2. Amazing; gorgeous; beautiful.

   • You should have seen her knockout eyes.

3. (genetics) Designating an organism in which a particular gene has been removed or deactivated.

4. Causing elimination from a competition.