Definition of "Boom" :

noun: any of various more-or-less horizontal spars or poles used to extend the foot of a sail or for handling cargo or in mooring

noun: a pole carrying an overhead microphone projected over a film or tv set

noun: a deep prolonged loud noise

noun: a sudden happening that brings good fortune (as a sudden opportunity to make money)

"The demand for testing has created a boom for those unregulated laboratories where boxes of specimen jars are processed like an assembly line."

noun: a state of economic prosperity

verb: grow vigorously

"Business is booming."

verb: hit hard

verb: make a deep hollow sound

"Her voice booms out the words of the song."

verb: make a resonant sound, like artillery

"His deep voice boomed through the hall."

verb: be the case that thunder is being heard