A person who is enthusiastic about sports and physical activities, often characterized by athletic ability. In high school, he was known as a jock because he excelled in football and basketball.
A piece of clothing worn by men to support the genitals during sports or physical activity, also known as a jockstrap. He always wore a jock during his rugby matches to ensure proper support.
A disc jockey; a radio presenter who plays and comments on recorded music. The late-night jock kept the listeners entertained with classic rock hits.