upsurge

noun

a sudden or abrupt strong increase
突然の急増加
- stimulated a surge of speculation
  思惑の高まりを刺激する
- an upsurge of emotion
  感情の高まり
- an upsurge in violent crime
  暴力犯罪の急増
a sudden forceful flow
突然の力強い流れ

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