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Classic usage
Reading level: hard
Estimated CEFR level: B2 — Upper-Intermediate
Estimated from word frequency; not an official CEFR classification.
Probably from Middle French grommeler, from Old French grumeler (“to murmur, grumble”), from Middle Dutch *grommelen ("to murmur, mutter, grunt"; > Modern Dutch grommelen (“to grumble”)), frequentative of Middle Dutch grommen (“to growl, grunt”). Cognate with Middle Low German grummelen (> Low German grummeln (“to grumble”)), German grummeln (“to grumble”), Norwegian dialectal grymja (“to growl, grunt”).
rumble, rumbling, grumbling
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Classic usage
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