| 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. |
[troo-bloo] 
| unwaveringly loyal or faithful; staunch; unchangingly true. |
| true-blue (trōō'blōō') adj. Loyal or faithful; staunch. [From the adoption of the color blue by 17th-century Scottish Presbyterians in opposition to the Royalists' red.] |