definition of
[boom]

[1] #1 boom v. [din] make a resonant sound, like artillery; "His deep voice boomed through the hall". wn

[2] #2 boom n. [roar, roaring, thunder] a deep prolonged loud noise. wn

[3] #3 boom v. [smash, nail, blast] hit hard; "He smashed a 3-run homer". wn

[4] #4 boom n. a state of economic prosperity. wn

[5] #5 boom v. [thunder] be the case that thunder is being heard; "Whenever it thunders, my dog crawls under the bed". wn