Simple past tense and past participle of upsurge.(verb)
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Use "upsurged" in a sentence
"And then the waters upsurged, as do the waters of a pond when a stone is thrown into it, and drowned the city."
"This should all come as no surprise to brands that found out with YouTube that group amusements would reliably generate a following, at least for a short while -- as Mentos saw in 2006 when its YouTube video of a mint exploding in a glass of Diet Coke upsurged its fan base on Facebook temporarily."
"Cases of Crimes have upsurged in thousands, a decade back in 1999, a total of 1, 35,771 cases were reported."