blab

To tell tales; to gossip without reserve or discretion.

And yonder a vile physician blabbing / The case of his patient.

1998, "Helga Blabs It All", TV episode in season 3 of Hey Arnold!, animated television series created by Craig Bartlett Helga Blabs It All.

to speak carelessly or excessively

One who blabs; a babbler; a telltale; a gossip or gossiper.

"You'd better have shoved your grey snout in a hornets' nest, Badger, than suggest that I am the blab," said Nikabrik.

Gossip; prattle.

Audie never liked him because he was further in with old Craig than he was, bragging and blowing about his work and the things he could do, while Audie sat quiet as a mouse listening to his blab.