knock-out
noun
Definitions
The act of making someone unconscious, or at least unable to come back on their feet within a certain period of time; a TKO.
Example: The boxer scored a knockout on his opponent.
The deactivation of anything.
Something wildly popular, entertaining, or funny.
Example: If you've ever had a sack race, you know it's a real knockout for kids and adults alike.
A very attractive person, especially a beautiful woman.