long. movable arm of an aerial device or crane.

Merriam-Webster Online Dictionary
boom (verb)
intransitive verb
to make a deep hollow sound
a) 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
transitive verb
d) to increase greatly in size or number - the population boomed
to cause to resound - often used with out his voice booms out the lyrics
to cause a rapid growth or increase of - boost
to hit or kick forcefully - boom a punt
boom (noun)
a sound or cry - booming often used interjectionally to indicate suddenness then boom, he was fired
a rapid expansion or increase 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
boom (noun)
a long spar used to extend the foot of a sail
a) 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
a) 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)
a spar or outrigger connecting the tail surfaces and the main supporting structure of an aircraft
boom (Wikipedia)

Boom usually refers to an onomatopoeic word for the sound that an explosion makes. Boom may also refer to:

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