Used to tell someone not to get involved in whatever you have going on
To refer to a private information that you do not want to share with someone else
My mother in law was not pleased when we politely told her that the honeymoon plan was none of her business.
When Paul tried to inquire about the reason for my divorce, I had to let him know that it is none of his business.
I know when to stay away from things that are none of my business.
Most people have no idea when they should avoid things that are none of their business.
In as much as she is my sister, I know that her dropping out of medical school to pursue music is really none of my business.
There is no origin for this idiom
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definition
Common phrase that has a specific meaning.