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English definition of “boom”

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boom

noun uk   /buːm/ us  

boom noun (SOUND)

boom noun (PERIOD OF GROWTH)

[C or U] a period of sudden economic growth, especially one that results in a lot of money being made: The insurance business suffered from a vicious cycle of boom and bust. the property boom [C usually singular] an increase in something , or a time when something becomes more popular: This year has seen a boom in book sales.
See also

boom noun (BOAT)

[C] specialized sailing (on a boat) a long pole that moves and that has a sail fastened to it

boom noun (FILMING)

[C] a long pole with a microphone on one end that is held above the actors so that it records their voices but cannot be seen by the people watching, used in television and film-making

boom

verb uk   /buːm/ us  

boom verb (MAKE A SOUND)

[I or T] to make a very deep and loud hollow sound: The cannons boomed (out) in the night. He boomed (out) an order to the soldiers.

boom verb (GROW)

[I] to increase or become successful and produce a lot of money very quickly: often in continuous tenses The leisure industry is booming.
booming
adjective uk   /ˈbuː.mɪŋ/ us  
a booming voice
(Definition of boom from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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