sewing machine leg
 n.— «Sometimes, it’s very painful to have very tight, contracted muscles. Some patients refer to it as their “sewing-machine” leg because it kind of bounces around. It can very bothersome, especially at night.» —“http://abcnews.go.com/Health/Healthology/story?id=572839″ by Christine Haran ABC News Mar. 11, 2005. (source: Double-Tongued Dictionary)

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