Blabber

Blabber is an English verb meaning to talk noisily and indiscreetly, especially to reveal information or secrets. It is often used with on or away to express prolonged, unnecessary talking, as in blabber on or blabber away. As a noun, a blabber or, more commonly, a blabbermouth, refers to a person who talks too much or reveals confidences; the term is informal and pejorative.

The word derives from blab, an onomatopoeic imitation of a noisy, careless utterance. Blabber as a derived form appeared in English in the 19th century, reinforcing a sense of repeated, uncontrolled speech.

In usage, blabber is informal and colloquial. It is generally avoided in formal writing, where alternatives such as "to reveal information indiscreetly" or "to talk at length without discretion" are preferred. Related terms include blab and blabbermouth; the latter is a more emphatic insult and occurs in both speech and popular culture references.