| Date: | 1300-1400 |
| Origin: | Probably from the sound |
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mut‧ter

1 [intransitive and transitive] to speak in a low voice, especially because you are annoyed about something, or you do not want people to hear you
Elsie muttered something I couldn't catch and walked off.
Elsie muttered something I couldn't catch and walked off.2 [intransitive] to complain about something or express doubts about it, but without saying clearly and openly what you think
mutter about
Some senators muttered darkly about the threat to national security.
Some senators muttered darkly about the threat to national security. —mutter noun [singular]
His voice subsided to a mutter.
His voice subsided to a mutter. —muttering noun [uncountable and countable]
The mutterings about his leadership continued to grow.
The mutterings about his leadership continued to grow.