blue line

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or blue line  (blo͞o′līn′)
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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

blue′ line`

either of two parallel lines that extend the width of an ice-hockey rink and divide it into three zones.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in classic literature ?
The brittle blue line had withstood the blows and won.
Their provisions were now exhausted, and they and their horses almost ready to give out with fatigue and hunger; when one afternoon, just as the sun was sinking behind a blue line of distant mountain, they came to the brow of a height from which they beheld the smooth valley of the Immahah stretched out in smiling verdure below them.
Daylight was waning, a splendid sun, like a red steel buckler, was plunging the lower extremity of its disc beneath the blue line of the sea.
From nearly all the windows of the house I can look out across the plain, with no obstacle in the shape of a hill, right away to a blue line of distant forest, and on the west side uninterruptedly to the setting sun--nothing but a green, rolling plain, with a sharp edge against the sunset.
The eyes of both were fixed upon the spot indicated by the sailor, and on the blue line separating the sky from the Mediterranean Sea, they perceived a large white sail.
Everything stood solid in its familiar place; the apple tree was too small to support or hide a climber; the only shed stood open and obviously empty; there was no sound save the droning of summer flies and the occasional flutter of a bird unfamiliar enough to be surprised by the scarecrow in the field; there was scarcely a shadow save a few blue lines that fell from the thin tree; every detail was picked out by the brilliant day light as if in a microscope.
A large scale map of Goat Island marked with red and blue lines to show these strategic movements would no doubt have displayed much interlacing, but as a matter of fact neither side saw anything of the other throughout that age-long day of tedious alertness.
NNA - In a press release by UNIFIL, it said: "In the wake of the serious incident along the Blue Line on 1 September that occurred amidst mounting tension following developments outside the UNIFIL area of operations, UNIFIL Head of Mission and Force Commander Major-General Stefano Del Col today called on Prime Minister Saad Hariri in Beirut." Following the meeting, Major-General Del Col said: "I had very useful discussions with the Prime Minister today.
Summary: Noida (Uttar Pradesh) [India], Aug 18 (ANI): In good news for commuters, a 300 metre-long walkway connecting Delhi Metro's Blue Line with Aqua Line of Noida Metro was made operational here on Sunday.
KARACHI -- A comprehensive public transport system for the people of Karachi remains a distant dream as provincial authorities have shelved the Blue Line project, one of the two Mass Rapid Transit (MRT) schemes, due to financial constraints, a top official confirmed on Saturday.
Summary: The situation along the Blue Line separating Lebanon and Israel is calm, a spokesman for the U.N.
With this latest contribution, Apex's donations to the organization now total $150,000, all raised through the sale of the company's Thin Blue Line Series triggers.