/ Dictionary / Index O overproof: Meaning and Definition of Find definitions for: o•ver•proof Pronunciation: (ō'vur-prf'), [key] — adj. containing a greater proportion of alcohol than proof spirit does. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. overpronounce overproportion Related Content Daily Word Quiz: belligerent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language