1. the two blue lines on a hockey rink that divide the ice into three zones
Usage: hockey
2. preliminary prints or proofs made with blue ink, especially in printing or drafting
Usage: printing; technical

Examples

• The player was called for offside when he crossed the bluelines ahead of the puck.
• Hockey players must stay onside relative to the bluelines during offensive plays.
• The referee positioned himself near the bluelines to watch for infractions.
• The printer provided bluelines for the client to review before final production.
• The architect examined the bluelines carefully before approving the changes.
• Quality control checked the bluelines against the original specifications.