bemurmur

/bɪˈmɜrmər/
verb
  1. To murmur to or about someone or something; to speak in a low, indistinct, or complaining tone.
    • The wind seemed to bemurmur through the old pine trees.
    • The crowd began to bemurmur as the speaker went over time.
    • She would often bemurmur her complaints under her breath during meetings.
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