Definitions

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

  • transitive v. To reveal (secret matters) especially through indiscreet or unreserved talk.
  • intransitive v. To reveal secret matters.
  • intransitive v. To chatter thoughtlessly or indiscreetly. See Synonyms at gossip.
  • n. An incessant or indiscreet talker.
  • n. Lengthy chatter.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • v. To tell tales; to gossip without reserve or discretion.
  • n. One who blabs; a babbler; a telltale; a gossip or gossiper.

from the GNU version of the Collaborative International Dictionary of English

  • n. One who blabs; a babbler; a telltale.
  • intransitive v. To talk thoughtlessly or without discretion; to tattle; to tell tales.
  • transitive v. To utter or tell unnecessarily, or in a thoughtless manner; to publish (secrets or trifles) without reserve or discretion; -- sometimes used with out.

from The Century Dictionary and Cyclopedia

  • To utter or tell in a thoughtless or unnecessary manner (what ought to be kept secret); let out (secrets).
  • To talk indiscreetly; tattle; tell tales.
  • To swell out or up; make swollen, as the cheeks.
  • n. A babbler; a telltale; one who betrays secrets, or tells things which ought to be kept secret.
  • n. A bubble; a blister; a swelling.

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

  • v. speak (about unimportant matters) rapidly and incessantly
  • v. divulge confidential information or secrets

Etymologies

Middle English blabben, to talk foolishly, back-formation from blaberen.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Middle English blabben ("to talk foolishly"), back-formation from blaberen. (Wiktionary)

Examples

  • I always watch on C-Span anyway to avoid all the blab from the commentators.

    Obama's Afghanistan plan wins conservative praise

  • And the blab is a skill far more common to Bill Clinton's generation than to Bob Dole's.

    Saxophone Vs. Sacrifice

  • Even when she reached her home again, and Mrs. Byrne followed her in, afraid of leaving the frightened woman alone lest she should "blab" the whole secret to the first person she met, -- even then Mrs. Cregan could not speak until she had gathered up the broken dishes and propped the broken chair against the wall, as frantically as if she were trying to conceal the evidence of a crime.

    McClure's Magazine, Vol 31, No 2, June 1908

  • Pinkey had warned him that at the first openly hostile act he would "blab" the story of the Skull Creek episode far and wide.

    The Dude Wrangler

  • Old Liz, meanwhile, was carefully confined to another part of the house so that she might not discover the plot, and the tiger, from whom no secrets could by any possibility be kept, was forbidden to "blab" on pain of instant death and dismissal.

    The Garret and the Garden

  • Just exactly the kind of blab we don't need, it's an infection.

    Yahoo! News: Business - Opinion

  • MPs 'blab' and governments are 'responsible for security'

    The Globe and Mail - Home RSS feed

  • After I'm dead and buried they'll jail you two healthy ones, and keep you until you 'blab'! "

    The Ivory Trail

  • Heh, I finally finished typing my post so if you went to that link and saw nothin, well, sorry! was blabbing! done now! you may now behold the blab that is my frustration!

    The Other Side Of Anger | Her Bad Mother

  • "Raj simply told Chiesi not to blab his trading position all over Wall Street," Mr. Dowd said.

    Galleon Defense Blasts Prosecution Case as 'Make-Believe'

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Comments

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  • "He caught my elbow in his eagerness and drew me towards the house. 'You can lie as snug here as if you were in a moss-hole. I'll see that nobody blabs, either. And you'll give me some more material about your adventures?'"
    - John Buchan, 'The Thirty-Nine Steps'.

    August 27, 2009