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Definition of 'boom'

Noun

  1. a deep prolonged loud noise
       Synonyms: roar roaring thunder
  2. a state of economic prosperity
  3. a sudden happening that brings good fortune (as a sudden opportunity to make money); "the demand for testing has created a boom for those unregulated laboratories where boxes of specimen jars are processed like an assembly line"
       Synonyms: bonanza gold rush gravy godsend manna from heaven windfall bunce
  4. a pole carrying an overhead microphone projected over a film or tv set
       Synonyms: microphone boom
  5. any of various more-or-less horizontal spars or poles used to extend the foot of a sail or for handling cargo or in mooring

Verb

  1. make a resonant sound, like artillery; "His deep voice boomed through the hall"
       Synonyms: din
  2. hit hard; "He smashed a 3-run homer"
       Synonyms: smash nail blast
  3. be the case that thunder is being heard; "Whenever it thunders, my dog crawls under the bed"
       Synonyms: thunder
  4. make a deep hollow sound; "Her voice booms out the words of the song"
       Synonyms: boom out
  5. grow stronger; "The economy was booming"
       Synonyms: prosper thrive get ahead flourish expand


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