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upsurge
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Example
The community experienced an upsurge in volunteer participation for local charity events.
Environmental activists have noticed an upsurge in public interest regarding climate change.
The city has seen an upsurge in tourism after the new amusement park opened.
There was an unexpected upsurge in stock prices following the positive earnings report.
The health department is concerned about the recent upsurge in flu cases this season.
