true blue

Short definition from Wiktionary

Adjective

1. 1
   Steadfastly faithful or loyal; unwavering in loyalty; staunch, true.
2. 2
   Steadfastly faithful or loyal; unwavering in loyalty; staunch, true: Patriotic.
3. 3
   Steadfastly faithful or loyal; unwavering in loyalty; staunch, true: Of or pertaining to the (historical) Tory, and now the Conservative, political party; hence, steadfastly conservative.
4. 4
   Steadfastly faithful or loyal; unwavering in loyalty; staunch, true: Of or pertaining to the Scottish Presbyterian or Whig political party in the 17th century; hence, steadfastly Presbyterian.
5. 5
   Representing the true essence of something; authentic, genuine, honest.
6. 6
   Representing the true essence of something; authentic, genuine, honest: Representing authentic Australian culture, values, etc.
7. 7
   Aristocratic by birth.
8. 8
   Used other than figuratively or idiomatically: see true, blue.
9. 9
   Alternative form of true blue.

Noun

1. 1
   A faithful partisan or supporter of a cause, person, political party, etc.
2. 2
   A blue dye from Coventry, England, famous for not washing out.
3. 3
   A precisely defined pure blue, as for example web color #0000FF = RGB(0,0,255).
4. 4
   Alternative form of true blue.