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English definition of “mutter”

mutter

verb [I/T]  /ˈmʌt̬·ər/ us  
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)
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