A low thundering, rumbling or growling sound.

The sound made by a hungry stomach.

A surly complaint.

“That whiner is never without a grumble to share.”

To make a low, growling or rumbling noise, like a hungry stomach or certain animals.

“The distant thunder grumbles.”

To complain; to murmur or mutter with discontent; to make ill-natured complaints in a low voice and a surly manner.

“He grumbles about the food constantly, but has yet to learn to cook.”

To utter in a grumbling fashion.