/ Dictionary / Index B blabbermouth: Meaning and Definition of Find definitions for: blab•ber•mouth Pronunciation: (blab'ur-mouth"), [key] — pl. -mouths a person who talks too much, esp. indiscreetly. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: blabbermouth (Thesaurus) blab black Related Content Daily Word Quiz: tactful Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language