Longman Dictionary of Contemporary English
swimming trunks
noun
EXAMPLES FROM CORPUS
▪ For women, tight trousers and top or a leotard or swimsuit; for men, swimming trunks would be ideal.
▪ Her eyes lowered suspiciously to the case and to the swimming trunks and sun cream already placed inside.
▪ His swimming trunks had a name-tape sewn to the waistband: J. Rossiter.
▪ I toyed with the idea of going up to her but was embarrassed to do so in my swimming trunks.
▪ Larson arrived early to unlock the front door and changed quickly into his swimming trunks.
Wiktionary
swimming trunks
n. A pair of shorts or briefs worn for swimming or bathing.
WordNet
swimming trunks
n. swimsuit worn by men while swimming [syn: bathing trunks]