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English definition of “mushroom”

mushroom

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 verb from the Cambridge Business English Dictionary © Cambridge University Press)
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