Blab

Blab, n. [OE. blabbe.] One who blabs; a babbler; a telltale. "Avoided as a blab." Milton.

For who will open himself to a blab or a babbler.
Bacon.

Blab (?), v. t. [imp. & p. p. Blabbed (?); 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. Udall.

And yonder a vile physician blabbing
The case of his patient.
Tennyson.

Blab, v. i. To talk thoughtlessly or without discretion; to tattle; to tell tales.

She must burst or blab.
Dryden.