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Loyal and steadfast. Her true-blue fans have continued to support her, even during this scandal.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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 © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The sense of someone being true blue may derive from the idea of someone being genuinely aristocratic, or having ‘blue blood’. In recent times, the term true blue has become particularly associated with loyal supporters of the British Conservative party.
Farlex Partner Idioms Dictionary © Farlex 2017
Staunchly loyal. This term comes from the old proverb “True blue will never stain,” which appeared in James Howell’s proverb collection of 1659. It referred to a blue dye that never ran, and therefore the color came to symbolize constancy, or, as John Ray described it in 1670, “one that was always the same and like himself,” a man of fixed principles. In Britain it was applied to loyal members of various groups, the Presbyterians of Scotland, the Whig Party, and later the Tories (whose official color was blue) and various university varsity teams. In America in the 1900s the term referred to team loyalty but has largely died out.
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer