Simple past tense and past participle of wreak.(verb)
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Use "wreaked" in a sentence
"Those 17 inches of rain wreaked havoc and several vineyards sustained a lot of damage."
"And yes, those recalls wreaked havoc with police fleets around the country which favor the Crown Vics."
"Brandon Routh guest starred on “Chuck” this whole season (which just ended in May) and unfortunately kind of wreaked havoc on the show … most of the fans hated him."