\ ˈbüm How to pronounce boom (audio) \
boomed; booming; booms

Definition of boom

 (Entry 1 of 3)

intransitive verb

1 : to make a deep hollow sound
2a : to increase in importance, popularity, or esteem
b : to experience a sudden rapid growth and expansion usually with an increase in prices business was booming
c : to develop rapidly in population and importance California boomed when gold was discovered there
d : to increase greatly in size or number the population boomed

transitive verb

1 : to cause to resound often used with outhis voice booms out the lyrics
2 : to cause a rapid growth or increase of : boost
3 : to hit or kick forcefully boom a punt

Definition of boom (Entry 2 of 3)

1 : a booming sound or cry often used interjectionally to indicate suddennessthen boom, he was fired
2 : a rapid expansion or increase: such as
a : a general movement in support of a candidate for office
b : rapid settlement and development of a town or district
c : a rapid widespread expansion of economic activity
d : an upsurge in activity, interest, or popularity a folk music boom

Definition of boom (Entry 3 of 3)

1 : a long spar used to extend the foot of a sail
2a : a chain or line of connected floating timbers extended across a river, lake, or harbor (as to obstruct passage or catch floating objects)
b : a temporary floating barrier used to contain an oil spill
3a : a long beam projecting from the mast of a derrick to support or guide cargo
b : a long more or less horizontal supporting arm or brace (as for holding a microphone)
4 : a spar or outrigger connecting the tail surfaces and the main supporting structure of an aircraft

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Examples of boom in a Sentence

Verb the sound of the bass drum booming His voice boomed out across the congregation. She boomed commands from the stern of the ship. “What's going on here?” he boomed. Housing construction has boomed in the past year. Last year we almost had to close the store, but now business is booming.
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First Known Use of boom


15th century, in the meaning defined at intransitive sense 1

Noun (1)

circa 1500, in the meaning defined at sense 1

Noun (2)

1627, in the meaning defined at sense 1

History and Etymology for boom


Middle English bomben, bummen, of imitative origin

Noun (2)

Dutch, tree, beam; akin to Old High German boum tree — more at beam

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Time Traveler for boom

Time Traveler

The first known use of boom was in the 15th century

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Statistics for boom

Cite this Entry

“Boom.” Dictionary, Merriam-Webster, Accessed 24 Jan. 2021.

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More Definitions for boom


How to pronounce boom (audio)

English Language Learners Definition of boom

: to make a deep and loud sound
: to say (something) in a deep and loud voice
of a business or industry : to grow or expand suddenly


\ ˈbüm How to pronounce boom (audio) \
boomed; booming

Kids Definition of boom

 (Entry 1 of 3)

1 : to make a deep, hollow, and loud sound The cannon boomed.
2 : to increase or develop rapidly Business boomed last year.



Kids Definition of boom (Entry 2 of 3)

1 : a deep, hollow, and loud sound
2 : a rapid increase in activity or popularity a sales boom



Kids Definition of boom (Entry 3 of 3)

1 : a long pole attached to the bottom of a sail
2 : a long beam sticking out from the mast of a derrick to support or guide something that is being lifted
3 : a long pole for holding a microphone

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