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1. A loud low dull continuous noise
   - rumble, rumbling, grumble
    
2. A complaint uttered in a low and indistinct tone
   - grumble, murmur, murmuring, mutter, muttering

1. Continuous full and low-pitched throbbing sound
   - rumbling

1. Show one's unhappiness or critical attitude
   "We grumbled about the increased work load"
   - grouch, scold
    
2. Make complaining remarks or noises under one's breath
   "she grumbles when she feels overworked"
   - murmur, mutter, croak, gnarl, chunter [Brit]
    
3. To utter or emit low dull rumbling sounds
   "he grumbled a rude response"; "Stones grumbled down the cliff"
   - growl, rumble
    
4. Make a low noise
   - rumble

Derived forms: grumblings

See also: full, grumbler

Type of: complain, complaint, emit, go, kick, kvetch [N. Amer], let loose, let out, noise, plain [archaic], quetch, sound, sound off, utter

Encyclopedia: Grumble