As a noun underpants is
underwear, clothing covering the genitalia.
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Not English
Wikidiffcom has no English definition. It may be misspelled. underpants
English
Synonyms
* (underwear) boxers, briefs, bloomers, (UK'') pants, panties, (slang) undies, tighty whities, knickers, drawers, (''slang, New Zealand ) gruds, longjohns, thong, underwear
See also
(Other terms of interest)
* boxer shorts
* kegs
* knickers
* panties
* Y-fronts