Meaning of “mutter” in the English Dictionary

"mutter" in British English

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mutterverb [ I or T ]

uk /ˈmʌt.ər/ us /ˈmʌt̬.ɚ/

B2 to speak quietly and in a low voice that is not easy to hear, often when you are worried or complaining about something:

Stop muttering and speak up!
He was muttering (away) to himself.
Laurence muttered something about his wife and left.
He muttered something under his breath to the person next to him.

More examples

mutternoun

uk /ˈmʌt.ər/ us /ˈmʌt̬.ɚ/

(Definition of “mutter” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"mutter" in American English

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mutterverb [ I/T ]

us /ˈmʌt̬·ər/

to speak quietly and in a voice that is not easy to hear, often when you are anxious or complaining about something:

[ I ] He muttered to himself as he walked.
[ T ] I heard him mutter something.
"There has to be another way," he muttered.

(Definition of “mutter” from the Cambridge Academic Content Dictionary © Cambridge University Press)