A defender is someone or something that protects, guards or defends against an attack, threat, or harm. In the context of sports, a defender is a player who primarily plays a defensive role in the game, often tasked with preventing the opposing team from scoring or advancing the ball. In legal terms, a defender is a lawyer who represents an accused person in a criminal trial, advocating for their rights and defending them against the charges brought by the prosecution. In general, a defender can refer to anyone or anything that defends, protects or guards against a perceived danger or threat.