v. 1 sound, resound, resonate, blast, rumble, thunder, roar, bang, explode We heard the cannons booming in the distance 2 prosper, thrive, flourish, progress, grow, increase, burgeon or bourgeon Business is booming in every sector
n. 3 blast, rumble, explosion There was a resounding boom and the car went up in flames 4 prosperity, profitability; growth, increase, burgeoning or bourgeoning In this business it is either boom or bust