Meaning of the word "true blue" in English

What does "true blue" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

true blue

US /truː bluː/
UK /truː bluː/

Adjective

loyal and faithful

Example:
He's a true blue friend, always there for me.
She's a true blue fan of the team, no matter what.