The idiom "show one's true colors" originated from the imagery of flags or banners used in battles or military campaigns. It refers to the act of displaying or demonstrating one's genuine character, intentions, or beliefs, especially when they are different from what was previously perceived or expected. The phrase emphasizes the idea that someone's true nature or motives become apparent when they are put to the test or when their true self is no longer concealed.

What is the origin of the idiom "show one's true colors" and when to use it?

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to [show|reveal] {one's} true colors

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英語での「 show one's true colors」の定義と意味

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