Meaning of TRUE BLUE in English

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.

[ 1665-75 ]

Random House Webster's Unabridged English dictionary.      Полный английский словарь Вебстер - Random House .