To crumble, rumble, or make a low continuous sound; to grumble or mutter.
Related to or variant of grumble; possibly influenced by Low German or Dutch grommelen (to grumble) and cognate with rumble.
English dialect words like 'grummel' show how regional pronunciations and variations created slightly different words for similar concepts—this probably represented a Midlands or Northern English way of saying what Londoners would call 'grumble.'
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