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