noun
a person who is loyal and faithful, especially to a cause or belief
adjective
loyal and faithful, especially to a cause or belief
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The true blue members of the organization always show up on time and ready to work.
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I know I can count on my true blue friends to have my back no matter what.
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She's a true blue fan of that band, she never misses a concert.
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His commitment to the cause was true blue, unwavering and steadfast.