wrinkle
noun
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a clever method of doing something, especially something new and different“I was shown a wrinkle that saved me many hours of work.”
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a minor difficulty“they finally have the wrinkles pretty well ironed out”
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a slight depression in the smoothness of a surfaceline
verb
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become wrinkled or crumpled or creased“This fabric won't wrinkle”crease
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make wrinkled or creasedfurrow
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make wrinkles or creases on a smooth surface“make a pressed, folded or wrinkled line in”crisp
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gather or contract into wrinkles or foldspurse