blue line

noun Ice Hockey.
either of two lines of the color blue that are parallel to and equidistant from the goal lines and divide the rink into three zones of equal size. Also called zone line. Compare end zone ( def 2 ), neutral zone.

Origin:
1925–30

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

blue line n.
A bluish line along a border of the gums resulting from chronic lead poisoning.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The blue line shows what you can infer from the plain information of parental
  phenotypes.
The blue is the shoreline, not an unnaturally straight blue line down the
  middle of the lake.
Indeed, if you looked at the picture closely, you could trace a thin blue line
  of sky between the two of them.
The blue line above indicates the target population for each ward after
  redistricting.
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