Webster's English Dictionary

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mumble

mum.ble \'m*m-b*l\ \-b(*-)lin\ \-b(*-)l*r\ vb or mum.bling [ME momelen, of 
   imit. origin] : to utter words in a low confused indistinct manner : MUTTER 
    1: to utter with a low inarticulate voice  2: to chew or bite with or as 
   if with toothless gums  - mumble n