1. Swimsuit worn by men while swimming
   "He packed his bathing trunks for the beach vacation";
   - swimming trunks, trunks, swim trunks [N. Amer]

Type of: bathers [Austral], bathing costume, bathing suit, cossie [Brit, informal], cozzie [Brit, informal], swimmers [Austral, informal], swimming costume, swimsuit, swimwear