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Definition of boom:

  1. A hollow roar, as of waves or cannon; also, the hollow cry of the bittern; a booming.
  2. A line of connected floating timbers stretched across a river, or inclosing an area of water, to keep saw logs, etc., from floating away.
  3. A long pole or spar, run out for the purpose of extending the bottom of a particular sail; as, the jib boom, the studding- sail boom, etc.
  4. A long spar or beam, projecting from the mast of a derrick, from the outer end of which the body to be lifted is suspended.
  5. A pole with a conspicuous top, set up to mark the channel in a river or harbor.
  6. A strong and extensive advance, with more or less noisy excitement; -- applied colloquially or humorously to market prices, the demand for stocks or commodities and to political chances of aspirants to office; as, a boom in the stock market; a boom in coffee.
  7. A strong chain cable, or line of spars bound together, extended across a river or the mouth of a harbor, to obstruct navigation or passage.
  8. To cause to advance rapidly in price; as, to boom railroad or mining shares; to create a boom for; as to boom Mr. C. for senator.
  9. To cry with a hollow note; to make a hollow sound, as the bittern, and some insects.
  10. To extend, or push, with a boom or pole; as, to boom out a sail; to boom off a boat.
  11. To have a rapid growth in market value or in popular favor; to go on rushingly.
  12. To make a hollow sound, as of waves or cannon.
  13. To rush with violence and noise, as a ship under a press of sail, before a free wind.


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