grumbles

[rumble.n.01] as in: a loud low dull continuous noise

[grumble.n.02] as in: a complaint uttered in a low and indistinct tone

[grouch.v.01] as in: show one's unhappiness or critical attitude

[murmur.v.02] as in: make complaining remarks or noises under one's breath

[grumble.v.03] as in: to utter or emit low dull rumbling sounds

[rumble.v.01] as in: make a low noise

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