Source:WordNet 3.1
1. (
) show one's unhappiness or critical attitude; "He scolded about anything that he thought was wrong"; "We grumbled about the increased work load" ;
2. (
) make complaining remarks or noises under one's breath; "she grumbles when she feels overworked" ;
3. (
) to utter or emit low dull rumbling sounds; "he grumbled a rude response"; "Stones grumbled down the cliff" ;
4. (
) make a low noise; "rumbling thunder" ;
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