#1 boom v. [din] make a resonant sound, like artillery; "His deep voice boomed through the hall". wn
#2 boom n. [roar, roaring, thunder] a deep prolonged loud noise. wn
#3 boom v. [smash, nail, blast] hit hard; "He smashed a 3-run homer". wn
#4 boom n. a state of economic prosperity. wn
#5 boom v. [thunder] be the case that thunder is being heard; "Whenever it thunders, my dog crawls under the bed". wn
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