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Noun: upsurge  'úp,surj
  1. A sudden forceful flow
    - rush, spate, surge, upswell
     
  2. A sudden or abrupt strong increase
    "an upsurge of emotion";
    - surge, upswell

Derived forms: upsurges

Type of: flow, flowing, increase, step-up

Encyclopedia: Upsurge