boom /bu:m/ I. n. ［c］ 1.(营业等的)激增，(经济等的)繁荣，迅速发展：business(economic) boom 生意兴旺（经济繁荣）；English boom 英语热 baby boom 生育高峰:［考句］The post-World War II baby boom resulted in a 43 percent increase in the number of teenagers in the 1960s and 1970s.二战后的生育高峰使得六十和七十年代的青少年增加了百分之四十三。2.隆隆声：booms of the gun 隆隆的炮声 ‖II.vi. 1.激增，繁荣，迅速发展：Business is booming these days; we shall all grow rich. 如今生意兴隆，我们都将富起来。2.发出隆隆声：The guns boomed. 炮声隆隆。