The phrase "knockout blow" refers to a powerful and decisive hit or action that completely defeats or incapacitates the opponent, often used in sports or conflicts. Full definition
Injustice 2 once again delivers knockout blows with its super-powered story and fighting, but finds a third way to entertain through an addictive collecting component. (videogamebroadcasts.com)
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Sony deftly landed one punch after another as they showed each trailer and delivered the absolute knockout blow with news of a Final Fantasy 7 remake, and that was only at about the show's halfway point. (gamingtrend.com)