Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “boom”

boom

noun uk   /buːm/ us  

boom noun (SOUND)

[C] a deep and loud hollow 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: This year has seen a boom in book sales. The insurance business suffered from a vicious cycle of boom and bust. the property boom

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)
What is the pronunciation of boom?
Browse related topics

You are looking at an entry to do with Poles, rods, shafts and sticks, but you might be interested in these topics from the Objects topic area:

Add Cambridge dictionaries to your browser to your website

Definitions of “boom” in other dictionaries

Word of the Day

for starters

used to say that something is the first in a list of things

Word of the Day

Countability – grammar codes

by Dom Glennon​​,
November 26, 2014
Advices and informations Have you ever noticed strange codes in square brackets on entries in Cambridge Dictionaries Online and wondered what they mean? These are grammar codes, giving you a brief summary of how that word behaves grammatically. More information can be obtained by hovering your cursor over the code, and there’s

Read More 

ped-text verb

November 24, 2014
to text someone while walking I’m ped-texting, I’m looking down at my phone, 75 percent of the time.

Read More