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English definition of “mushroom”

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verb [I]
/ˈmʌʃruːm/ informal
to increase in number or develop very quickly: Low-cost airlines have mushroomed in recent years.mushroom into sth The walkout mushroomed into a large-scale battle.mushroom from sth to sth Area budgets mushroomed from $3.7 billion in 2005 to more than $6.3 billion this fiscal year.
(Definition of mushroom from the Cambridge Business English Dictionary © Cambridge University Press)
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