Meaning

• Talk, especially meaningless or unimportant talk.

• The sound of talking.

• The sound made by a magpie.

• An intermittent noise, as from vibration.

  "Proper brake adjustment will help to reduce the chatter."

• In national security, the degree of communication between suspect groups and individuals, used to gauge the degree of expected terrorist activity.

Meaning

• To talk idly.

  "They knitted and chattered the whole time."

• Of teeth, machinery, etc, to make a noise by rapid collisions.

  "He was so cold that his teeth were chattering."

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