Definition of mutter in English:

mutter

Pronunciation /ˈmədər/

verb

reporting verb
  • 1Say something in a low or barely audible voice, especially in dissatisfaction or irritation.

    • ‘he muttered something under his breath’
    • ‘“I knew she was a troublemaker,” Rebecca muttered’
    • ‘she muttered in annoyance as the keys slid from her fingers’
    talk under one's breath, murmur, mumble, whisper, speak in an undertone, speak sotto voce, speak in hushed tones
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    1. 1.1no object Speak privately or unofficially about someone or something; spread rumors.
      ‘when he disappeared, people began to mutter’
      grumble, moan, complain, grouse, carp, whine, bleat
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noun

  • A barely audible utterance, especially one expressing dissatisfaction or irritation.

    ‘a little mutter of disgust’
    complaint, grumble, moan, mutter, murmur, grouse, objection, protest, protestation, outcry, demur, argument, remonstrance, remonstration, exception, grievance, cavil, quibble, word, sound
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Origin

Late Middle English imitative; compare with German dialect muttern.

Pronunciation

mutter

/ˈmədər/