IdiomDaily LifeEnglish

none of one's business

Meaning: Private; not for anybody else to know.

Example: “How much I paid for the car is none of your business.”

Origin: Builds on "business" in its older sense of one's personal affairs or private concerns, a usage documented from around 1600 — considerably broader than the narrower modern sense of commercial enterprise. "None of your business," using that private-affairs sense, is documented from the early 1800s, though the underlying idea of guarding personal matters from outside interference is naturally much older than any specific wording for it. A jocular, slightly softer variant, "none of your beeswax," playing on the sound of "business" rather than its meaning, arose as American slang by around 1930.

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