kupaći

1. bathing; swimming
   Zaboravila sam kupaći kostim kod kuće. — I left my swimsuit at home.
   Kupaća sezona na moru počinje u junu. — The swimming season at the seaside starts in June.

2. colloq. swimsuit
   Ponesi kupaći, idemo na Adu. — Bring your swimsuit, we're going to Ada.

Most often found in kupaći kostim "swimsuit" and kupaće gaće "swimming trunks".