noun
definition
A repressed or obscure utterance; an instance of muttering.
example
The prisoners were docile, and accepted their lot with barely a mutter.
verb
definition
To utter words, especially complaints or angry expressions, indistinctly or with a low voice and lips partly closed; to say under one's breath.
example
The beggar muttered words of thanks, as passersby dropped coins in his cup.
definition
To speak softly and incoherently, or with imperfect articulations.
example
The asylum inmate muttered some doggerel about chains and pains to himself, over and over.
definition
To make a sound with a low, rumbling noise.
example
April could hear the delivery van's engine muttering in the driveway.