A knockout blow is the strike that ends a fight. Land a knockout blow, a clean knockout blow.
It works by moving the head suddenly rather than by force alone, which is why a punch to the jaw does it. A knockout blow in argument is the figurative use and means the point nothing survives.
1nounknockout blowThe strike that ends a fight.
“The knockout blow came thirty seconds into the second round.”
knockout blow is a blow.
Practised in Hitting & Pushing