Definition of "grumble"

grumble

/ˈɡɹʌmbl̩/

noun
plural grumbles
1. (onomatopoeia) A low thundering, rumbling or growling sound.
2. The sound made by a hungry stomach.
3. A surly complaint.
verb
third-person singular simple present grumbles, present participle grumbling, simple past and past participle grumbled
1. (intransitive) To make a low, growling or rumbling noise, like a hungry stomach or certain animals.
  Quotations
  It made his stomach grumble in protest to think the mule was eating, and here he was worrying about her with an empty belly of his own.
  1995, Terry C. Johnston, Dance on the Wind, page 15
2. (intransitive) To complain; to murmur or mutter with discontent; to make ill-natured complaints in a low voice and a surly manner.
3. (transitive) To utter in a grumbling fashion.
  Quotations
  He grumbled that there was no grain "in the country" and that people were talking instead of working to provide it.
  2001, Harry Willcox Pfanz, Gettysburg — the first day