verb

• (transitive, figuratively, of speech) To exclaim with force, to shout, to thunder.
  "I was about to reach for the marmalade, when I heard the telephone tootling out in the hall and rose to attend to it. “Bertram Wooster's residence,” I said, having connected with the instrument. “Wooster in person at this end. Oh hullo,” I added, for the voice that boomed over the wire was that of Mrs Thomas Portarlington Travers of Brinkley Court, Market Snodsbury, near Droitwich – or, putting it another way, my good and deserving Aunt Dahlia. [...] “I'd give a tenner to have Aubrey Upjohn here at this moment.” “You can get him for nothing. He's in Uncle Tom's study.” Her face lit up. “He is?” [Aunt Dahlia] threw her head back and inflated the lungs. “UPJOHN!” she boomed, rather like someone calling the cattle home across the sands of Dee, and I issued a kindly word of warning. “Watch that blood pressure, old ancestor.”"
• (intransitive) To flourish, grow, or progress.
  "The population boomed in recent years."
• (transitive) To make (something) boom.
  "Men in grey robes slowly boom the drums of death."
• (of a Eurasian bittern) To make a deep, resonant, territorial vocalisation.
  "Miles on miles of quagmire, varied only by bright green strips of comparatively solid ground, and by deep and sullen pools fringed with tall rushes, in which the bitterns boomed and the frogs croaked incessantly[.]"

noun

• (economics, business) A period of prosperity, growth, progress, or high market activity.
• (aviation) Ellipsis of sonic boom.
• (computer chess, slang) An instance of booming.
  "Some chess commentators know to excitedly point out when booms happen but they almost universally are missing out on the next step of explaining what the boom meant."

noun

• (sailing) A spar extending the foot of a sail; a spar rigged outboard from a ship's side to which boats are secured in harbour.
  "Tighten the outhaul and place the appropriate line in the cam cleat located on the boom about two feet back from the mast."
• (videography)
• (videography)
• (electronics) The longest element of a Yagi-Uda antenna, on which the other, smaller antennae are transversally mounted.

verb

• (usually with "up" or "down") To raise or lower with a crane boom.