/ Dictionary / Index U underpants: Meaning and Definition of Find definitions for: un•der•pants Pronunciation: (un'dur-pants"), [key] — n. (used with a pl. v.) drawers or shorts worn under outer clothing, usually next to the skin. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: underpants (Thesaurus) underpainting underpart Related Content Daily Word Quiz: inutiae Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language