Webster's English Dictionary

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chatter

chat.ter \'chat-*r\ vb [ME chatteren, of imit. origin] 1: to utter rapidly 
   succeeding sounds somewhat like language but inarticul ate and indistinct 
   {squirrels ~ed angrily} {a ~ing stream} 2: to talk idly, incessantly, or 
   fast : JABBER  3a: to click repeatedly or uncontrollably {~ing teeth}  of a 
   tool  3b: to vibrate rapidly in cutting  1: to utter rapidly, idly, or 
   indistinctly  dial Eng  2: TEAR, SHATTER  3: to cut unevenly with a 
   chattering tool  - chatter n