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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.

Synonyms:

gravy, dash, sounds, manna from heaven, extend, arrest, blow up, spread out, go, flesh out, shell, expand, manna, complete, peg, break, smash, pinpoint, bang up, lucubrate, bunce, expound, collar, wave, thunder, prosper, inflate, smash up, elaborate, yowl, bellow, pan gravy, cop, holloa, nail, knock down, amplify, bellowing, flourish, scag, windfall, crush, miraculous food, roar, thrive, din, sweep through, roll, grumble, bonanza, boom out, bankrupt, expatiate, holla, shoot, pass with flying colors, breeze through, nail down, blast, pick up, demolish, pillory, growl, apprehend, nab, savage, enlarge, skag, ruin, ace, exposit, hell dust, score, nose drops, rumble, brandish, roaring, noise, hollering, get ahead, microphone boom, holler, increase, dilate, hollo, crucify, godsend, fly high, growth, rush, inflation, gold rush, big H, sail through.

Usage examples: