|Origin:||Probably from the sound|
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
mutter to yourself
'I never want to come here again,' he muttered to himself.
Elsie muttered something I couldn't catch and walked off.
'He's such an unpleasant man,' Alyssia muttered under her breath.
What are you two muttering about?
to complain about something or express doubts about it, but without saying clearly and openly what you think
Some senators muttered darkly about the threat to national security.
—mutter noun [singular]
His voice subsided to a mutter.
—muttering noun [uncountable and countable]
The mutterings about his leadership continued to grow.