grumble

Noun
  1. A loud low dull continuous noise (synset 107407083)
    "they heard the rumbling of thunder"
  2. A complaint uttered in a low and indistinct tone (synset 107225752)
Verb
  1. Show one's unhappiness or critical attitude (synset 200911526)
    "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 (synset 200911172)
    "she grumbles when she feels overworked"
  3. To utter or emit low dull rumbling sounds (synset 201047591)
    "he grumbled a rude response"; "Stones grumbled down the cliff"
  4. Make a low noise (synset 202191766)
    "rumbling thunder"

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