貼身穿在褲子裡的短內褲(用法隨地區不同)
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men's underpants (BrE) · noun · B1
A short piece of underwear that men and boys wear next to their skin, under their trousers. This is the British English use of the word: it names the men's kind, and the word for the women's kind is knickers.
男用內褲