boom

US /bum/

UK /bu:m/

B1 中級
n. (c./u.)名詞 (可算/不可算)ブーム、流行
There was a population boom in this area in the 1970s
v.i.自動詞ブームとなる
Economies tend to boom and bust in cycles
v.i.自動詞大きな音を出す
Guns boom loudly when you shoot them
n. (c./u.)名詞 (可算/不可算)大きな音
The boom of the gun could be heard half a kilometer away

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