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

true-blue

[troo-bloo] /ˈtruˈblu/
adjective
1.
unwaveringly loyal or faithful; staunch; unchangingly true.
Origin
1665-75
Examples from the web for true blue
  • 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.
  • If you have doubted whether someone was true blue, you might get proof.
  • If you prove you are true blue, you will attract others who are honest and fair as well.
  • People who are not good for you seem to fade out of the picture while your true blue supporters are under foot.
  • He is true blue, which is as rare a color among birds as it is among flowers.
  • The flowers are a true blue, and abundant in the spring.
British Dictionary definitions for true blue

true-blue

adjective
1.
unwaveringly or staunchly loyal, esp to a person, a cause, etc
noun
2.
(mainly Brit) a staunch royalist or Conservative
Idioms and Phrases with true blue

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.”