Main entry: grumble, grumbling, murmur, murmuring, mutter, muttering
Definition: a complaint uttered in a low and indistinct tone
Main entry: rumble, rumbling, grumble, grumbling
Definition: a loud low dull continuous noise
Usage: they heard the rumbling of thunder
Main entry: murmur, mutter, gnarl, grumble, croak
Definition: make complaining remarks or noises under one's breath
Usage: she grumbles when she feels overworked
Main entry: grumble, grouch, scold
Definition: show one's unhappiness or critical attitude
Usage: He scolded about anything that he thought was wrong; We grumbled about the increased work load
Main entry: growl, grumble, rumble
Definition: to utter or emit low dull rumbling sounds
Usage: he grumbled a rude response; Stones grumbled down the cliff
Definition: make a low noise
Usage: rumbling thunder