ˈɡɹʌmbl̩ ˈmɜː.mə(ɹ) ˈmɝ.mɚ ˈ(h)wɪspəɹɪŋ making a low continuous indistinct sound like murmuring waves susurrant voices a complaint uttered in a low and indistinct tone a low continuous indistinct sound; often accompanied by movement of the lips without the production of articulate speech