Chatter \Chat"ter\, v. i. [imp. & p. p. Chattered; p. pr. & vb. n. Chattering.]

[Of imitative origin. Cf. Chat, v. i. Chitter.]

1. To utter sounds which somewhat resemble language, but are inarticulate and indistinct.

The jaw makes answer, as the magpie chatters. --Wordsworth.

2. To talk idly, carelessly, or with undue rapidity; to jabber; to prate.

To tame a shrew, and charm her chattering tongue. --Shak.

3. To make a noise by rapid collisions.

With chattering teeth, and bristling hair upright. --Dryden.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Chatter \Chat"ter\, v. t. To utter rapidly, idly, or indistinctly.

Begin his witless note apace to chatter. --Spenser.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Chatter \Chat"ter\, n.

1. Sounds like those of a magpie or monkey; idle talk; rapid, thoughtless talk; jabber; prattle.

Your words are but idle and empty chatter. --Longfellow.

2. Noise made by collision of the teeth, as in shivering.

Source: Webster's Revised Unabridged Dictionary (1913)