bombinate \BOM-buh-nayt\ (intransitive verb) - To buzz; to hum; to drone.
"Like his co-workers he had been somewhat stampded by Dorn's imitative faculties, faculties which enabled the former journalist to bombinate twice as loud in a void three times as great as any of his colleagues." -- Ben Hecht, 'Erik Dorn'
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Bombinate is from Late Latin bombinatus, past participle of bombinare, alteration of Latin bombilare, from bombus, "a boom."