boom

a loud explosive sound the nerve-jangling boom of a car backfiring Synonyms bang, blast, clap, crack, crash, pop, report, slam, smash, snap, thunderclap, thwack, whack, whomp, whumpRelated Words thunk, wham; clang, clangor, clank, clash; knock, rap, tap; blare, clamor, howl, hubbub, hue and cry, hullabaloo, outcry, roar, tumult, uproar

1 to become greater in size, extent, volume, amount, or number requests for hybrid cars are booming Synonyms accelerate, accumulate, appreciate, balloon, increase, build up, burgeon (also bourgeon), climb, enlarge, escalate, expand, gain, mount, multiply, mushroom, proliferate, rise, roll up, snowball, spread, swell, waxRelated Words jump, rocket, skyrocket, surge; heighten, intensify, redouble; blow up, bulk, distend, inflate, puff (up); crescendo, crest, peakAntonyms contract, decrease, diminish, dwindle, lessen, recede, wane

2 to make a long loud deep noise or cry the cannons boomed throughout the night Synonyms bellow, roar, growl, thunderRelated Words grumble, roll, rumble; bang, blare, blast, peal, scream, screech, shriek, squall; bawl, call, cry, holler, hoot, shout, whoop, yell; bell, caterwaul, howl, wail, yowlNear Antonyms grunt, mouth, mumble, murmur, mutter, whisper; mewl, pule, squeak, whimper