to reveal what one is really like
to uncover one’s actual character or nature
to betray someone
to reveal one’s real personality or intentions
show one’s true stripes
I trusted her blindly, but when I was in need too much and called her for help, she showed her true colors.
David looked nice initially, but he showed his true colors when I asked him for help.
The American team showed their true colors by beating China.
After being elected, the corrupt politician showed his true colors.
Mark eventually showed his true colors and revealed that he was manipulative and selfish.
As social media became more popular, fans got to see Janelle’s true colors outside of the show.
Don’t trust Olivia. I’ve seen her true colors.
There is no origin for this idiom
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definition
Common phrase that has a specific meaning.