v. i. To talk thoughtlessly or without discretion; to tattle; to tell tales. [ 1913 Webster ]

She must burst or blab. Dryden. [ 1913 Webster ]

n. [ OE. blabbe. ] One who blabs; a babbler; a telltale. “Avoided as a blab.” Milton. [ 1913 Webster ]

For who will open himself to a blab or a babbler. Bacon. [ 1913 Webster ]

v. t. [ imp. & p. p. Blabbed (blăbd); p. pr. & vb. n. Blabbing. ] [ Cf. OE. blaberen, or Dan. blabbre, G. plappern, Gael. blabaran a stammerer; prob. of imitative origin. Cf. also Blubber, v. ] To utter or tell unnecessarily, or in a thoughtless manner; to publish (secrets or trifles) without reserve or discretion; -- sometimes used with out. Udall. [ 1913 Webster ]

And yonder a vile physician blabbing
The case of his patient. Tennyson. [ 1913 Webster ]

n. one who blabr; a tattler; a telltale.
Syn. -- blabbermouth. [ 1913 Webster ]

n. someone who gossips indiscreetly.
Syn. -- blabber, tattletale, taleteller, talebearer, telltale. [ WordNet 1.5 ]

adj. 1. tending to talk excessively.
Syn. -- bigmouthed, blabby, talkative. [ WordNet 1.5 ]

2. prone to revealing secrets; -- of people.
Syn. -- leaky, talebearing(prenominal), tattling(prenominal). [ WordNet 1.5 ]

adj. same as blabbermouthed 1.
Syn. -- bigmouthed, blabbermouthed, talkative. [ WordNet 1.5 ]

n. a genus of insects consisting of giant cockroaches.
Syn. -- genus Blaberus. [ WordNet 1.5 ]