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Definition of boom verb from the Oxford Advanced American Dictionary

     

    boom

     verb
    verb
    NAmE//bum//
     
    Verb Forms present simple I / you / we / they boom
     
     he / she / it booms
     
     past simple boomed
     
     -ing form booming
     
     
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    make loud sound
  1. 1[intransitive] to make a loud, deep sound Outside, thunder boomed and crashed.
  2. 2[transitive, intransitive] to say something in a loud, deep voice + speech “Get out of my sight!” he boomed. boom (out) A voice boomed out from the darkness. He had a booming voice.
    3. of business/economy
  3. 3[intransitive] to have a period of rapid growth; to become bigger, more successful, etc. By the 1980s, the computer industry was booming. Business is booming!
See boom in the Oxford Advanced Learner's Dictionary
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