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English definition of “upsurge”

upsurge

noun [C]     /ˈʌp.sɜːdʒ/ US  /-sɝːdʒ/
a sudden and usually large increase in something: An upsurge of/in violence in the district has been linked to increased unemployment.Increasing and intensifying
(Definition of upsurge noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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