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Noun: upswell
  1. A sudden or abrupt strong increase
    "stimulated an upswell of speculation";
    - surge, upsurge, insurgence
     
  2. A sudden, often forceful flow
    "An upswell of magma caused the volcano to erupt violently";
    - rush, spate, surge, upsurge, tide

Derived forms: upswells

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