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. 2013.
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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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Blue line is always a great word to know.
So is interrobang. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
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The blue line above indicates the target population for each ward after
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Spending time flagging the blue line will make the final layout work easier and
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