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From The Collaborative International Dictionary of English v.0.48:
blue jeans \blue" jeans`\, n. pl. a tight-fitting trousers made of blue denim or a similar fabric, designed originally to serve as inexpensive durable workclothes, and often having metal rivets for reinforcement. They have become very popular as casual wear for all age groups, and more expensive and more carefully styled and tailored versions called designer jeanshave also become popular among girls and women. Syn: jeans, Levis. [1913 Webster]