swimming trunks

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