1. a supportive undergarment worn by male athletes to protect the genitals during sports

Examples

• The football player put on his jockstrap before practice.
• Athletic supporters like jockstraps are required equipment for contact sports.
• He forgot to pack his jockstrap in his gym bag.
• The coach reminded all players to wear their jockstraps during the game.
• Sports stores sell jockstraps in the athletic equipment section.