blabber(noun, verb) noun1. one who reveals confidential information in return for moneySimilar word(s): betrayer, informer, rat, squealerDefinition categories: person, informant, source verb1. speak (about unimportant matters) rapidly and incessantlySimilar word(s): blab, chatter, clack, gabble, gibber, maunder, palaver, piffle, prate, prattle, tattle, twaddleDefinition categories: communication, mouth, speak, talk, utter, verbalise, verbalize