Simple past tense and past participle of overturn.(verb)
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Use "overturned" in a sentence
"The case being overturned is the important thing to the vast majority of people."
"The number they're citing of Sotomayor's decisions that have been overturned is the number of Supreme Court decisions based on Sotomayor's appellate court decisions."
"The fear tactic by Obama, that somehow Roe v Wade will be overturned, is just that, a tactic."