blab Meaning, Definition & Usage

  1. verb divulge confidential information or secrets
    let the cat out of the bag; peach; babble; spill the beans; babble out; tattle; blab out; sing; talk.
    • Be careful--his secretary talks
  2. verb speak (about unimportant matters) rapidly and incessantly
    prate; chatter; tattle; piffle; gabble; gibber; clack; tittle-tattle; prattle; maunder; palaver; blabber; twaddle.

WordNet

Blab transitive verb
Etymology
Cf. OE. blaberen, or Dan. blabbre, G. plappern, Gael. blabaran a stammerer; prob. of imitative origin. Cf. also Blubber, v.
Wordforms
imperfect & past participle Blabbed (); present participle & verbal noun Blabbing
Definitions
  1. To utter or tell unnecessarily, or in a thoughtless manner; to publish (secrets or trifles) without reserve or discretion. Udall.
    And yonder a vile physician blabbing The case of his patient. Tennyson.
Blab intransitive verb
Definitions
  1. To talk thoughtlessly or without discretion; to tattle; to tell tales.
    She must burst or blab. Dryden.
Blab noun
Etymology
OE. blabbe.
Definitions
  1. One who blabs; a babbler; a telltale. "Avoided as a blab." Milton.
    For who will open himself to a blab or a babbler. Bacon.

Webster 1913