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Use "unrip" in a sentence
"You know it comes about this wide [three feet] and they'd sew it up each side, so if you're going to make a sheet, you just unrip one side and hem the ends."
"So unrip your gown and give me the samples of the goods."
"They carried their search so far as to rummage the pockets of my old clothes, and even to unrip the linings."