a horse of another colour

horse of another color

A person or thing completely different or unique, especially in comparison to someone or something else. I've always found math to be pretty easy, but calculus is proving to be a horse of another color. Most politicians would have resigned after a scandal like that, but this senator is a horse of another color.
See also: another, color, horse, of
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

a horse of another (or different) colour

a thing significantly different.
1975 Sam Selvon Moses Ascending Two or three is okay, but when you start bringing in a battalion, it is a horse of a different colour.
See also: another, colour, horse, of
Farlex Partner Idioms Dictionary © Farlex 2017
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