from
The Collaborative International Dictionary of English v.0.48
Blab \Blab\ (bl[a^]b), v. t. [imp. & p. p. {Blabbed} (bl[a^]bd);
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]