bathing trunks

plural plural-only

A pair of shorts or briefs worn for swimming or bathing.

Japanese Meaning

水泳や入浴の際に着用する、ショートパンツまたはブリーフの一種（主に男性用の水着）

He forgot his bathing trunks at the hotel and had to buy a new pair before the pool opened.

彼はホテルに海パンを忘れてしまい、プールが開く前に新しい一着を買わなければならなかった。

Sense（1）

A pair of shorts or briefs worn for swimming or bathing.

His bathing trunks were ruined and he didn't have another pair.