noun
underpants
UHN-duh-pants
noun
1
A piece of underwear covering the lower torso and genitals, worn beneath outer clothing.
"He packed enough underpants and socks for the whole trip."
How to Use Underpants
Learner’s notesIn plain EnglishThe underwear you wear beneath your trousers or skirt.
UK vs US
In British English "pants" alone usually means underpants, while Americans use "pants" for trousers — "underpants" avoids the confusion in both dialects.
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Fill the Gap
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He packed enough _____ and socks for the whole trip.
Etymology
From under- plus pants.