knockout

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. Something wildly popular, entertaining, or funny. (informal) · If you've ever had a sack race, you know it's a real knockout for kids and adults alike.
4. A very attractive person, especially a beautiful woman. (informal)
5. A partially punched opening meant for optional later removal. · They left a knockout in the panel for running extra wires someday.
6. The deactivation of a particular gene.
7. A creature engineered with a particular gene deactivated.
8. An event where a foreground color causes a background color not to print.

الجمع knockouts