n. 25B6; noun
the boom of the waves on the rocks : REVERBERATION, resonance, thunder, echoing, crashing, drumming, pounding, roar, rumble.
an unprecedented boom in sales : UPTURN, upsurge, upswing, increase, advance, growth, boost, escalation, improvement.
slump.
25B6; verb
thunder boomed overhead : REVERBERATE, resound, resonate; rumble, thunder, blare, echo; crash, roll, clap, explode, bang.
a voice boomed at her : BELLOW, roar, thunder, shout, bawl; informal holler.
the market continued to boom : FLOURISH, burgeon, thrive, prosper, progress, improve, pick up, expand, mushroom, snowball.
whisper, slump.