Webster's English Dictionary

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mutter

mut.ter \'m*t-*r\ \-*r-*r\ vb [ME muteren; akin to L muttire to mutter, 
   mutus mute] 1: to utter indistinctly or with a low voice and lips partly 
   closed  2: to murmur complainingly or angrily : GRUMBLE  : to utter esp. in 
   a low or imperfectly articulated manner  - mutter n