blother

Verb

blather (third-person singular simple present blathers, present participle blathering, simple past and past participle blathered)

1. (derogatory, intransitive) To talk rapidly without making much sense.
   • “There you go blatherin’,” said Brindle, intending a mild rebuke.1866, George Eliot [pseudonym; Mary Ann Evans], chapter XI, in Felix Holt, the Radical […], volume I, Edinburgh; London: William Blackwood and Sons, →OCLC, page 249
2. (derogatory, transitive) To say (something foolish or nonsensical); to say (something) in a foolish or overly verbose way.
   • Then, just before the wedding, the old man feels he’s honor bound to tell his future son-in-law the secret of his past; so the damned idiot blathers the whole story of his killing the man and breaking jail!1929, Eugene O’Neill, Dynamo, New York, N.Y.: Liveright, act I, scene i, page 31

See all 3 meanings of blather