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English definition of “mutter”

mutter

verb [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.

mutter

noun uk   /ˈmʌt.ər/ us    /ˈmʌt̬.ɚ/

mutter noun (QUIET WORDS)

[S] (the sound of) words being said very quietly: I heard the soft mutter of voices in the next room.

mutter noun (COMPLAINT)

[C] a complaint that is made to only a few people: There were mutters that other departments received more money than ours.
(Definition of mutter from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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