Definitions from Wiktionary (grumble)

▸ noun:  (onomatopoeia) A low thundering, rumbling or growling sound.
▸ noun:  The sound made by a hungry stomach.
▸ noun:  A surly complaint.
▸ verb:  (intransitive) To make a low, growling or rumbling noise, like a hungry stomach or certain animals.
▸ verb:  (intransitive) To complain; to murmur or mutter with discontent; to make ill-natured complaints in a low voice and a surly manner.
▸ verb:  (transitive) To utter in a grumbling fashion.
▸ Also see grumble

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