1[intransitive usually in progressive] if business, trade, or a particular area is booming, it is increasing and being very successful: Business was booming, and money wasn’t a problem. Tourism on the island has boomed.2 (also boom out) [transitive] to say something in a loud deep voice: ‘Ladies and gentlemen,’ his voice boomed out.3 (also boom out) [intransitive] to make a loud deep sound: Guns boomed in the distance.—booming adjective: a booming economy
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