kɹoʊk kɹəʊk ˈɡɹʌmbl̩ ˈɡɹʌmbl̩ ˈmɔːndə ˈmɔndɚ ˈmʌmbəl ˈmɜː.mə(ɹ) ˈmɝ.mɚ ˈmɜː.mə(ɹ) ˈmɝ.mɚ ˈmʌ.sɪ.teɪt make complaining remarks or noises under one's breath she grumbles when she feels overworked talk indistinctly; usually in a low voice 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