Definition of "boom" []

To make a deep, resonant sound. (verb-intransitive)
To grow, develop, or progress rapidly; flourish: Business is booming. (verb-intransitive)
To utter or give forth with a deep, resonant sound: a field commander booming out orders. (verb-transitive)
To cause to grow or flourish; boost. (verb-transitive)
A deep resonant sound, as of an explosion. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Use "boom" in a sentence

"The cool metal vibrated under his hand, and, even as he waited, a deeper vibration went through the wall, boom, _boom_, low and rhythmic, like the beating of some great hidden heart, like the heart of the mountain itself, vast and stony and old."
"_Boom, boom, boom_, it broke nearer and nearer, as if a vast cordon of cannon was being drawn around the horizon."
"_Boom, boom, boom_, it broke nearer and nearer as if a vast cordon of cannon was being drawn around the horizon."

Words like "boom"

advanced arm beam boomed booming booms

crane go happening hit hum jib

natural event noise occurrence occurrent pole prosperity

recession resonance resound sound spar