the.com/knockout

The one argument everyone agrees on: whoever's unconscious lost.

means Something so stunningly effective or beautiful that it ends all debate on the spot — a decisive blow, a flawless win, or a person/thing of striking impact.

from A straightforward compound from boxing: 'knock' plus 'out,' describing the blow that knocks a fighter out of the fight (and often out cold), first used literally for a fight-ending punch before the 19th century closed out and the word got stretched to mean anyone or anything devastatingly impressive — a stunning dress, a brilliant idea, a knockout of a smile.

ten count origin
Giving the fallen fighter a chance, theoretically
brain physics
Rotational force, not raw punch strength, causes it
slang drift
Became shorthand for anything stunningly attractive or good
medical term
Technically a concussion with better production value
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