horse of a different color

horse of a different color or horse of another color  {n. phr.},  {informal}
Something altogether separate and different.
Anyone can be broke, but to steal is a horse of a different color.
Do you mean that the boy with that pretty girl is her brother? I thought he was her boyfriend. Well, that's a horse of another color.
Categories: informal noun
Source: A Dictionary of American Idioms

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