blue jeans

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun plural Pants made of blue denim.

from the GNU version of the Collaborative International Dictionary of English.

• noun plural 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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A pair of trousers made from denim cotton and dyed dark blue.