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

1.
costume da bagno, pantaloncini da bagno
a pair of shorts worn by men for swimming
:
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He forgot his swimming trunks and had to buy a new pair.
Ha dimenticato i suoi costumi da bagno e ha dovuto comprarne un paio nuovo.
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The lifeguard was wearing bright red swimming trunks.
Il bagnino indossava un costume da bagno rosso brillante.