knock-out

noun

1. 1

   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.”

2. 2

   The deactivation of anything.

3. 3

   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. 4

   A very attractive person, especially a beautiful woman.

5. 5

   A partially punched opening meant for optional later removal.

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

6. 6

   The deactivation of a particular gene.

7. 7

   A creature engineered with a particular gene deactivated.

8. 8

   An event where a foreground color causes a background color not to print.

9. 9

   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. 10

    A simple game for two or more players, derived from basketball.

11. 11

    A knockout auction.