Grumble /ˈɡrʌm.bəl/
(Verb) To complain about someone or something in an annoyed way. To make ill-natured complaints in a low voice and a surly manner. To murmur or mutter with discontent. To make a low, growling or rumbling noise, like a hungry stomach or certain animals.
If your stomach grumbles, it makes a low, continuous noise, usually because you are hungry. (Noun) A complaint. A low thundering, rumbling or growling sound. The sound made by a hungry stomach.
From Middle French grommeler 'mutter between the teeth' or directly from Middle Dutch grommelen 'murmur, mutter, grunt', from grommen 'to rumble, growl'. Imitative, or perhaps akin to grim (adj.). With unetymological -b- as in mumble. Cognate with German grummeln ('to grumble').

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