A "duck" in the context of Dodge refers to a specific maneuver used in various sports and games, particularly in American football. It involves quickly moving the body to avoid an incoming object, such as a ball or a tackle, allowing the player to evade potential contact or danger. The term can also apply to Dodgeball, where players must dodge balls thrown by opponents. Mastering the duck technique can enhance a player's agility and reaction time, making it a valuable skill in competitive environments.