Idiom none of your businessnone of (your) business do not interest yourself in matters that do not involve you.“Those children should never be left alone.” “Don't tell me what to do — it's none of your business.”
idiomnone of your businessspoken a rude expression used in order to tell someone that they do not have a right to know something private:Well, I'm not telling you because it's none of your business!"Have you got a boyfriend, Kathleen?" "None of your business."
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