The American Heritage® Dictionary of the English Language, 4th Edition
n. Either of two blue lines running across an ice-hockey rink, usually 60 feet from each goal, and dividing the rink into defensive, neutral, and offensive zones.
n. A reproduction of the material submitted for printing, computer-generated or printed from film, provided to the customer for approval before the material is printed.
Word Usage
"A lot of the high end talent comes on the blueline, which is a bit of a twist."