/ Dictionary / Index U underdog: Meaning and Definition of Find definitions for: un•der•dog Pronunciation: (un'dur-dôg", -dog"), [key] — n. a person who is expected to lose in a contest or conflict. a victim of social or political injustice: The underdogs were beginning to organize their protests. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: underdog (Thesaurus) underdo underdone 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