athletic supporter

noun2

1. •
   An elastic garment supporting and defending male genitalia from modest injury. A jock strap.

   • As part of my equipment I am wearing an athletic supporter over a pair of jockey shorts. — 1832
2. •
   A booster for a cheerleading team.

   • We were the best athletic supporters that ever lived. We paired off: cheerleader and basketball player, like a socialite wife and corporation executive, leading lady and leading man. — 2004