true blue

noun
1.
a nonfading blue dye or pigment.
2.
a person who is true-blue.
3.
(in the 17th century) the color adopted by the Covenanters in contradistinction to the royal red.

Origin:
1665–75

Dictionary.com Unabridged

true-blue

[troo-bloo]
adjective
unwaveringly loyal or faithful; staunch; unchangingly true.

Origin:
1665–75

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
true-blue
 
adj
1.  unwaveringly or staunchly loyal, esp to a person, a cause, etc
 
n
2.  chiefly (Brit) a staunch royalist or Conservative

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Idioms & Phrases

true blue

Loyal, faithful, as in You can count on her support; she's true blue. This expression alludes to the idea of blue being the color of constancy, but the exact allusion is disputed. One theory holds it alludes to the unchanging blue sky, another to the fastness of a blue dye that will not run. Blue has been the identifying color of various factions in history. In the mid-1600s the Scottish Covenanters, who pledged to uphold Presbyterianism, were called true blue (as opposed to red, the color of the royalists). In the 1800s the same term came to mean "staunchly Tory," and in America, "politically sound."

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
Blue whales look true blue underwater, but on the surface their coloring is
  more a mottled blue-gray.
When seen with other blueberries in our nursery, the foliage is as true blue as
  you can get.
He was a true blue blood or a smooth fraud or some of both.
His color is good, his hair a thick mixture of old brown and new gray, his eyes
  true blue.
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