Fender can also refer to a part of a vehicle, usually a car or boat, that helps to prevent damage to the body of the vehicle in the event of a collision or contact with another object. In this context, a fender is usually a protruding section that extends from the body of the vehicle and is made of a durable material like plastic or metal. Fender can also be used as a verb to describe the act of using a fender or other object to prevent damage to a vehicle or other object. For example, a boater might use a fender to keep their boat from bumping into a dock.