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Classic usage
Reading level: hard
Estimated CEFR level: B2 — Upper-Intermediate
Estimated from word frequency; not an official CEFR classification.
Onomatopoeic, perhaps borrowed; compare German bummen, Dutch bommen (“to hum, buzz”). The sense "a period of economic growth" is generally taken to derive from the sense "a rapid expansion", although other origins have also been suggested.
roar, roaring, thunder
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Classic usage
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