[chat.ter] vb [ME chatteren, of imit. origin] vi (13c) 1: to utter rapid short sounds suggestive of language but inarticulate and indistinct "squirrels ~ed angrily" "a ~ing stream"
2: to talk idly, incessantly, or fast: jabber 3 a: to click repeatedly or uncontrollably "teeth ~ing with cold" "machine guns ~ing" b: to vibrate rapidly esp. as a consequence of repeated sticking and slipping "~ing brakes" ~ vt: to utter rapidly, idly, or indistinctly -- chat.ter.er n
[2]chatter n (13c) 1: the action or sound of chattering
2: idle talk: prattle