Main Entry: mut·ter

Pronunciation: \ˈmə-tər\

Function: verb

Etymology: Middle English muteren, of imitative origin

Date: 14th century

intransitive verb 1 : to utter sounds or words indistinctly or with a low voice and with the lips partly closed
2 : to murmur complainingly or angrily : grumbletransitive verb : to utter especially in a low or imperfectly articulated manner

— mutter noun

— mut·ter·er \-tər-ər\ noun