noun
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.
verb
To create the bluelines for material that is about to be printed.
To check the bluelines before printing material.
To veto a portion of a budget.
To edit a legal document.
(surgery) To mark on a patient's body where the surgical incision is to be made.
(US, Canada) To designate a certain area as representing one in which investment is risky.