trunks

noun[plural only]6

1. •
   Shorts or briefs used especially for sports.
2. •
   Swimming trunks.

   • Spread your legs and hang on till your trunks rip right up the back. — 1966
3. •
   Trunk briefs.

   • Roger came through, rustling up four shirts and trousers, two belts, pointed out the underwear selections, where Alex riffled through the boxers, boxer-briefs, and trunks, choosing a package of each. — 2021
4. •
   (UK) Men’s or boys’ boxer shorts or boxer briefs.
5. •
   Trunkhose.
6. •
   The game of nineholes.