A low-pitched, resonant sound, such as of an explosion.

“The boom of the surf.”

A rapid expansion or increase.

“You should prepare for the coming boom in the tech industry.”

One of the calls of certain monkeys or birds.

To make a loud, hollow, resonant sound.

“I can hear the organ slowly booming from the chapel.”

(of speech) To exclaim with force, to shout, to thunder.

To make something boom.

“Men in grey robes slowly boom the drums of death.”

Used to suggest the sound of an explosion.

Used to suggest something happening suddenly and unexpectedly.