Definition of upsurge noun from the Oxford Advanced Learner's Dictionary

 

upsurge

 noun
noun
BrE BrE//ˈʌpsɜːdʒ//
 
; NAmE NAmE//ˈʌpsɜːrdʒ//
 
[usually singular](formal)
 
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a sudden large increase in something upsurge (in something) an upsurge in violent crime upsurge (of something) a recent upsurge of interest in his movies
See the Oxford Advanced American Dictionary entry: upsurge