Dictionary

mutter

verb mut·ter \ˈmə-tər\

: to speak quietly so that it is difficult for other people to hear what you say

: to complain in a quiet or indirect way

Full Definition of MUTTER

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 :  grumble
transitive verb
:  to utter especially in a low or imperfectly articulated manner
mutter noun
mut·ter·er \-tər-ər\ noun
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Origin of MUTTER

Middle English muteren, of imitative origin
First Known Use: 14th century
MUTTERER Defined for Kids

mutter

verb mut·ter \ˈmə-tər\
mut·teredmut·ter·ing

Definition of MUTTER for Kids

1
:  to speak in a low voice with lips partly closed <He muttered an apology.>
2
:  to complain in a low voice :  grumble <She muttered about the bad food.>

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