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English definition of “upsurge”

upsurge

noun [C, usually singular]     /ˈʌpsɜːdʒ/
a sudden large increase in something: upsurge in sth The recent upsurge in people working beyond the retirement age is due to the falling value of pension funds and savings .
(Definition of upsurge noun from the Cambridge Business English Dictionary © Cambridge University Press)
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