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
a pole carrying an overhead microphone projected over a film or tv set
- microphone boom
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"
- gold rush - manna from heaven
a state of economic prosperity
a deep prolonged loud noise
"The deer population in this town is thriving"
"business is booming"
make a deep hollow sound
"Her voice booms out the words of the song"
- boom out
be the case that thunder is being heard
"Whenever it thunders, my dog crawls under the bed"
"He smashed a 3-run homer"
make a resonant sound, like artillery
"His deep voice boomed through the hall"