babble

(v) utter meaningless sounds, like a baby, or utter in an incoherent way
- The old man is only babbling--don't pay attention
(v) to talk foolishly
- The two women babbled and crooned at the baby
blather, blether, blither, smatter,
(v) flow in an irregular current with a bubbling noise
- babbling brooks
burble, guggle, gurgle, bubble, ripple,
(v) divulge confidential information or secrets
- Be careful--his secretary talks
babble out, blab, blab out, let the cat out of the bag, peach, spill the beans, tattle, sing, talk,

babbling lallation blather blether blither smatter burble guggle gurgle bubble ripple babble out blab blab out let the cat out of the bag peach spill the beans tattle sing talk

keep one's mouth shut keep quiet shut one's mouth

babble out babbler