/ Dictionary / Index U undertrump: Meaning and Definition of Find definitions for: un•der•trump Pronunciation: (un"dur-trump', un'dur-trump"), [key] — v.t., v.i. Cards. to trump with a lower trump than has already been played. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. undertrick underused Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language