blueline

/ˈbluːlaɪn/
noun
  1. A line or route marked in blue, especially a line on a map or a transportation route (such as a subway or bus line).
    • The hiking trail is marked with a blueline on the map.
    • Take the blueline to the airport; it stops right at the terminal.
    • She lives near the blueline station, so her commute is very easy.
  2. In hockey, the blue line that divides the rink into zones; also used figuratively to refer to a defensive position or boundary.
    • He crossed the blueline and took a shot on goal.
    • The team's blueline is strong this season with two new defenders.
    • The defenseman held the puck at the blueline to keep the play onside.
  3. A proof or copy of a document, drawing, or map that has blue lines (from an old photographic reproduction process).
    • We need to check the blueline for any errors in the measurements.
    • The engineer marked changes directly on the blueline with a red pen.
    • The architect reviewed the blueline before sending the final plans to the builder.
What does "blueline" mean? | whatsthatwordmean | whatsthatwordmean