To utter words imperfectly or indistinctly, as children do; prattle; jabber.To talk idly, irrationally, or thoughtlessly; chatter or prate heedlessly or mischievously.To make a continuous murmuring sound, as a stream; repeat a sound frequently and indistinctly.To utter incoherently or with meaningless iteration; repeat; prate.To utter foolishly or thoughtlessly; let out by babbling or prating: as, to babble a plot or a secret.n. Inarticulate speech, such as that of an infant; idle talk; senseless prattle; murmur, as of a stream.n. Synonyms See prattle, n.