/ Dictionary / Index U underskirt: Meaning and Definition of Find definitions for: un•der•skirt Pronunciation: (un'dur-skûrt"), [key] — n. a skirt, as a petticoat, worn under another skirt or a dress. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: underskirt (Thesaurus) undersized undersleeve Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language