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English definition of “boom”

boom

verb [I or T] (MAKE A SOUND)    /buːm/
to make a very deep and loud hollow sound : The cannons boomed (out) in the night . He boomed (out) an order to the soldiers .Sounds made by objects, movement or impactSounds made by humans with their mouths booming     /ˈbuː.mɪŋ/ adjective a booming voice Noise and noisy
(Definition of boom verb (MAKE A SOUND) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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