Simple past tense and past participle of corset.(verb)
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Use "corseted" in a sentence
"Though no expert, I'd say the technical term for what she had on was "corseted"; that is, rather tight around the midsection and calculated to amplify what in my wife's grandmother's time was referred to as a "bosom.""
"The white satin dress with the corseted bodice and lace appliqué was exquisitely beautiful, and perfectly suited the bride's personality, figure and modest tastes."