The term used to describe an unexpected and powerful punch capable of knocking out an opponent or significantly changing the course of a fight in boxing or mixed martial arts (MMA) is known as a “lucky punch” or “lucky shot.” This term emphasizes that such a strike may occur more due to luck or chance circumstances rather than a fighter’s strategy or game plan.

A lucky punch or lucky shot often becomes a sensational moment in sports, as it is not always predictable or expected and can lead to surprising outcomes in a bout.