Which game is associated with term knock out?

The term "knock out" is most commonly associated with the sport of boxing. In boxing, a knockout occurs when a boxer is struck with a punch that causes them to lose consciousness or be unable to continue fighting. The term "knock out" can also be used in other sports, such as mixed martial arts (MMA) and Muay Thai, to refer to a similar situation where a fighter is rendered unconscious or unable to continue due to a strike.