To utter a succession of quick, shrill, inarticulate sounds, as a magpie or a monkey.To make a rapid rattling noise, as the teeth, from cold or fright.To talk thoughtlessly, idly, or rapidly; jabber; gabble.To argue.To jar, so as to form a series of nicks or notches, as a cutting-tool.To utter as one who or that which chatters: as, to chatter nonsense.n. succession of quick, shrill, inarticulate sounds, especially if discordant or jarring, like those uttered by a magpie or a monkey; rapid and imperfectly articulated utterance.n. The noise made by the teeth striking together repeatedly and rapidly, as under the influence of cold or fright.n. Idle or foolish talk.n. Synonyms See prattle, n.