Other forms: swimsuits
A swimsuit is what you wear in a pool or the sea. Pack a swimsuit, a one-piece swimsuit, a swimsuit and a towel.
British English also says swimming costume, or cossie informally, and American English says bathing suit. Swimming trunks is the usual word for the men's version in Britain. Competitive swimsuits are a technology in themselves, and some were banned from Olympic competition in 2010 for giving too much advantage. Note swimwear, the shop category, and that a wetsuit is a different garment for a different purpose.
1nounswimsuitA garment worn for swimming.
“The swimsuit was still wet from the day before.”
synonyms: bathing suit, swimming costume
swimsuit is a garment.
Also accepted in games: bathing suit, swimming costume
From swim + suit.
Etymology from Wiktionary, CC BY-SA