If something grumbles, it makes a low continuous sound. It was quiet now, the thunder had grumbled away to the west The dogs made a noise, a rough, grumbling sound. Grumble is also a noun. One could often hear, far to the east, the grumble of guns
To murmur or mutter with discontent; to make ill-natured complaints in a low voice and a surly manner
make complaining remarks or noises under one's breath; "she grumbles when she feels overworked"
To rumble; to make a low, harsh, and heavy sound; to mutter; as, the distant thunder grumbles
a complaint uttered in a low and indistinct tone to utter or emit low dull rumbling sounds; "he grumbled a rude response"; "Stones grumbled down the cliff