kɹoʊk kɹəʊk ɡɹaʊtʃ ɡɹaʊl ɡɹaʊl ˈɡɹʌmbl̩ ˈɡɹʌmbl̩ ˈmɜː.mə(ɹ) ˈmɝ.mɚ ˈmɜː.mə(ɹ) ˈmɝ.mɚ ˈɹʌmb(ə)l ˈɹʌmb(ə)l skəʊld skoʊld make complaining remarks or noises under one's breath she grumbles when she feels overworked show one's unhappiness or critical attitude He scolded about anything that he thought was wrong We grumbled about the increased work load to utter or emit low dull rumbling sounds he grumbled a rude response Stones grumbled down the cliff make a low noise rumbling thunder a complaint uttered in a low and indistinct tone a loud low dull continuous noise they heard the rumbling of thunder