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A knockout is a blow that renders a person unconscious. Knocking out one’s opponent is one way to win a match in combat sports like boxing and mixed martial arts. A typical knockout—like anesthesia—results in a sustained loss of consciousness and memory. Repeated knockouts can cause brain injury. A “technical knockout” can be declared by a referee when a fighter cannot stand or cannot safely continue to fight, even if he or she is still conscious. What causes loss of consciousness in a knockout? Discuss
Source: The Free Dictionary