Definition of Blab

Verb: blab (blabbed,blabbing) blab

Divulge confidential information or secrets
"Be careful--his secretary blabs";
- spill the beans, let the cat out of the bag, talk, tattle, peach, babble, sing, babble out, blab out
Speak (about unimportant matters) rapidly and incessantly
- chatter, piffle, palaver, prate, tittle-tattle, twaddle, clack, maunder, prattle, gibber, tattle, blabber, gabble, vapor [Brit, Cdn], witter [Brit], rabbit [Brit], yabber [Brit], yatter [Brit]