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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:

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

honk, racket, blast, tumult, tumultuousness, roar, din, noisiness, uproariousness, boisterousness, hubbub, sonority, uproar, clangor, stridency, vociferousness, clamor, blare, loudness

flap, whack, slap, rap, tap, click, bang, report, crack, bump, slam, clack, crash, burst, snap, thump, thwack, clap, smack, knock, crepitation

Usage examples:

• This great pocket of cord, fit to hold perhaps a bushel or more, is swung from the boom above, and lowered into the midst of the catch. - "American Merchant Ships and Sailors", Willis J. Abbot.
• As for the Coal enterprise nothing could possibly happen to disturb it; I was all ready for the first of July announcement and boom. - "The Deluge", David Graham Phillips.
• The Idol has been to see him twice, in the evening, and both times I have heard my father's jolly laugh boom out in a way the nurse says will have to stop, for it made Mother ask to see him and be ill because she couldn't. - "Phyllis", Maria Thompson Daviess.