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- DictionaryBoom/bo͞om/
noun
- 1. a loud, deep, resonant sound: "the deep boom of the bass drum"
verb
- 1. make a loud, deep, resonant sound: "thunder boomed in the sky"
exclamation
- 1. used to imitate a loud, deep, resonant sound: "the boat was lifted up and then boom, down it went"