/ Dictionary / Index O oppugn: Meaning and Definition of Find definitions for: op•pugn Pronunciation: (u-pyn'), [key] — v.t. to assail by criticism, argument, or action. to call in question; dispute. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: oppugn (Thesaurus) opprobrium oppugnant Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language