/ Dictionary / Index B bad-mouth: Meaning and Definition of Find definitions for: bad-mouth Pronunciation: (bad'mouth" or, sometimes, -mou"), [key] — -mouthed, -mouth•ing. to speak critically and often disloyally of; disparage: Why do you bad-mouth your family so much? Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: bad-mouth (Thesaurus) badminton bad news Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language