1. [n]  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
2. [n]  a pole carrying an overhead microphone projected over a film or tv set
3. [n]  a deep prolonged loud noise
4. [n]  a sudden happening that brings very good fortune
5. [n]  a state of economic prosperity
6. [v]  grow stronger; "The economy was booming"
7. [v]  hit hard; "He smashed a 3-run homer"
8. [v]  make a deep hollow sound; "Her voice booms out the words of the song"
9. [v]  make a resonant sound; as of artillery; "His deep voice boomed through the hall."
10. [v]  be the case that thunder is being heard; "Whenever it thunders, my dog crawls under the bed"

Boom
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1. \Boom\ (b[=oo]m), n. [D. boom tree, pole, beam, bar. See
   {Beam}.]
   1. (Naut.) 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.
   2. (Mech.) 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.
   3. A pole with a conspicuous top, set up to mark the channel
      in a river or harbor. [Obs.]
   4. (Mil. & Naval) 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.
   5. (Lumbering) A line of connected floating timbers stretched
      across a river, or inclosing an area of water, to keep saw
      logs, etc., from floating away.
   {Boom iron}, one of the iron rings on the yards through which
      the studding-sail booms traverse.
   {The booms}, that space on the upper deck of a ship between
      the foremast and mainmast, where the boats, spare spars,
      etc., are stowed. --Totten.
   

2. \Boom\ (b[=oo]m), v. t. (Naut.)
   To extend, or push, with a boom or pole; as, to boom out a
   sail; to boom off a boat.
   

3. \Boom\ (b[=oo]m), v. i. [imp. & p. p. {Boomed}, p. pr. &
   vb. n. {Booming}.] [Of imitative origin; cf. OE. bommen to
   hum, D. bommen to drum, sound as an empty barrel, also W.
   bwmp a hollow sound; aderyn y bwmp, the bird of the hollow
   sound, i. e., the bittern. Cf. {Bum}, {Bump}, v. i., {Bomb},
   v. i.]
   1. To cry with a hollow note; to make a hollow sound, as the
      bittern, and some insects.
            At eve the beetle boometh Athwart the thicket lone.
                                                  --Tennyson.
   2. To make a hollow sound, as of waves or cannon.
            Alarm guns booming through the night air. --W.
                                                  Irving.
   3. To rush with violence and noise, as a ship under a press
      of sail, before a free wind.
            She comes booming down before it.     --Totten.
   4. To have a rapid growth in market value or in popular
      favor; to go on rushingly.
   

4. \Boom\, n.
   1. A hollow roar, as of waves or cannon; also, the hollow cry
      of the bittern; a booming.
   2. 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. [Colloq. U. S.]
   

5. \Boom\, v. t.
   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. [Colloq. U. S.]