swimming trunks
US /ˈswɪm.ɪŋ ˌtrʌŋks/
UK /ˈswɪm.ɪŋ ˌtrʌŋks/

1.
a pair of shorts worn by men for swimming
:
•
He forgot his swimming trunks and had to buy a new pair.
•
The lifeguard was wearing bright red swimming trunks.
a pair of shorts worn by men for swimming