A tight-fitting swimsuit, especially commonly worn by competitive swimmers and divers. Usually implies a brief or bikini style swimsuit.
(by restriction) A male swimsuit, very tight fitting and small, brief-style, and not a thong-type.
A style of tightfitting men's swimming costume cut like underwear briefs that covers the buttocks and groin but not the legs and reveals the bulge of the genitals; especially worn in surf lifesaving and in swimming races.