Answer
Meaning of mutter:
verb
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1.say something in a low or barely audible voice, especially in dissatisfaction or irritation."he muttered something under his breath"
sinónimos: talk under one's breath, murmur, mumble, whisper, speak in an undertone "a group of men stood muttering" -
noun
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1.a barely audible utterance, especially a dissatisfied or irritated one."a little mutter of disgust"