"boom" in the noun sense
1. boom, roar, roaring, thunder
a deep prolonged loud noise
a state of economic prosperity
3. boom, bonanza, gold rush, gravy, godsend, manna from heaven, windfall, bunce
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"
4. boom, microphone boom
a pole carrying an overhead microphone projected over a film or tv set
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
"boom" in the verb sense
1. boom, din
make a resonant sound, like artillery
"His deep voice boomed through the hall"
2. smash, nail, boom, blast
"He smashed a 3-run homer"
3. thunder, boom
be the case that thunder is being heard
"Whenever it thunders, my dog crawls under the bed"
4. boom, boom out
make a deep hollow sound
"Her voice booms out the words of the song"
5. boom, thrive, flourish, expand
"The deer population in this town is thriving"
"business is booming"
Source: WordNet® (An amazing lexical database of English)
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