tattle

nouns

disclosing information or giving evidence about another
singing, tattle, telling

verbs

speak (about unimportant matters) rapidly and incessantly
blab, blabber, chatter, clack, gabble, gibber, maunder, palaver, piffle, prate, prattle, tattle, tittle-tattle, twaddle
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
tattler