Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • intransitive v. To chatter; babble.
  • n. Idle chatter.
  • n. A blabbermouth.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • v. to run one's mouth in such a way as to (inadvertently/unintentionally) spoil a surprise
  • n. A person who blabs; a tattler; a telltale.

from the GNU version of the Collaborative International Dictionary of English

  • n. one who blabr; a tattler; a telltale.

from The Century Dictionary and Cyclopedia

  • To speak inarticulately; babble; mumble.
  • To tell tales; blab; talk idly.
  • To fib; falter.
  • To whistle to a horse.
  • Swollen; protruding: as, blabber-lipped; blabber cheeks.
  • n. A tattler; a telltale.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • v. speak (about unimportant matters) rapidly and incessantly
  • n. one who reveals confidential information in return for money

Etymologies

Middle English blaberen.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Middle English blaberen (Wiktionary)

Examples

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  • Mudambo was so excited to see his saviours he could hardly speak. "Gah bless you bloth!" he blabbered.

    - William Steig, Doctor De Soto Goes to Africa

    September 20, 2008