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  Dictionary Definition of boom

boom [1]
verb (i)
1. to make a deep, prolonged, resonant sound; make a rumbling, humming, or droning noise.
2. to move with a resounding rush or great impetus.
3. to progress or flourish vigorously, as a business, a city, etc.
-- verb (t)
4. Also, boom out. to give forth with a booming sound: the clock boomed out twelve.
-- noun
5. a deep, hollow, continued sound.
6. a roaring, rumbling, or reverberation, as of waves or distant guns.
7. the cry of the bittern.
8. a period of high economic growth and general prosperity, especially when seen as part of a cycle ( boom and bust ) of prosperity and decline.
9. an increase in support or enthusiasm for: a boom in sailboarding.
10. a rise in popularity, as of a political candidate.
-- adjective
11. caused by a boom: boom prices.
[imitative Cf. ZOOM ]