What does “none of my business” mean?

Not something the speaker has a right to know about or get involved in; often a polite disclaimer before asking or commenting anyway.

How is “none of my business” used?

In Paris, Texas (1984), one line is: “I know. It's none of my business.”

The clip at the top of this page is from Paris, Texas (1984).

I know. It's none of my business.

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