"blab" in the verb sense
1. spill the beans, let the cat out of the bag, talk, tattle, blab, peach, babble, sing, babble out, blab out
divulge confidential information or secrets
2. chatter, piffle, palaver, prate, tittle-tattle, twaddle, clack, maunder, prattle, blab, gibber, tattle, blabber, gabble
speak (about unimportant matters) rapidly and incessantly
Source: WordNet® (An amazing lexical database of English)
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