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Noun: boom  boom
  1. A deep prolonged loud noise
    - 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";
    - bonanza, gold rush, gravy [informal], godsend, manna from heaven, windfall, bunce [Brit, informal]
  4. A pole carrying an overhead microphone projected over a film or tv set
    - 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
  6. A floating barrier used to obstruct the entry of a harbour, contain oil spills, etc.
Verb: boom  boom
  1. Make a resonant sound, like artillery
    "His deep voice boomed through the hall";
    - din
  2. Hit with great force
    "He boomed a 3-run homer";
    - smash, nail, blast
  3. Be the case that thunder is being heard
    "Whenever it booms, my dog crawls under the bed";
    - thunder
  4. Make a deep hollow sound
    "Her voice booms out the words of the song";
    - boom out
  5. Grow vigorously
    "business is booming";
    - thrive, flourish, expand

Derived forms: booms, booming, boomed

Type of: go, grow, happening, hit, natural event, noise, occurrence, occurrent, pole, prosperity, sound, spar

Part of: sailing ship, sailing vessel

Encyclopedia: Boom, Like That