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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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