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Definitions of grumble
  1. verb
    to utter or emit low dull rumbling sounds
    "he grumbled a rude response" "Stones grumbled down the cliff"

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  2. noun
    a complaint uttered in a low and indistinct tone
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  3. verb
    show one's unhappiness or critical attitude
    "We grumbled about the increased work load"

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  4. verb
    make complaining remarks or noises under one's breath
    "she grumbles when she feels overworked"

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  5. verb
    make a low noise

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  6. noun
    a loud low dull continuous noise
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Parts of grumble

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