ɡɹaʊl ɡɹaʊl ɡɹaʊl ɡɹaʊl ˈɡɹʌmbl̩ ˈɹʌmb(ə)l to utter or emit low dull rumbling sounds he grumbled a rude response Stones grumbled down the cliff the sound of growling (as made by animals)