horse of a different colour

Noun

UK alt-of alternative

(British spelling) Alternative form of horse of a different color

Japanese Meaning

全く別の話（全く異なる種類・性質の事柄を示すイディオム）

His success in local elections doesn't guarantee national appeal; that's a horse of a different colour.

彼の地方選での成功が全国的な支持を保証するわけではない。それは全く別の話だ。

Sense（1）

(British spelling) Alternative form of horse of a different color