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Noun
- a complaint uttered in a low and indistinct tone
- a loud low dull continuous noise
- they heard the rumbling of thunder
Verb
- to utter or emit low dull rumbling sounds
- he grumbled a rude response
- Stones grumbled down the cliff
- 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