blab

verbs

divulge confidential information or secrets
"Be careful--his secretary talks"
babble, babble out, blab, blab out, let the cat out of the bag, peach, sing, spill the beans, talk, tattle
is derived from
blabber
speak (about unimportant matters) rapidly and incessantly
blab, blabber, chatter, clack, gabble, gibber, maunder, palaver, piffle, prate, prattle, tattle, tittle-tattle, twaddle