boom

US /bum/

UK /bu:m/

B1
n. (c./u.)Noun (Countable/Uncountable)Very fast increase in growth or popularity
There was a population boom in this area in the 1970s
v.i.Intransitive VerbTo experience a rapid increase in growth
Economies tend to boom and bust in cycles
v.i.Intransitive VerbTo make a very loud and deep sound
Guns boom loudly when you shoot them
n. (c./u.)Noun (Countable/Uncountable)A very loud and deep sound
The boom of the gun could be heard half a kilometer away

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