have no business doing something
idiomPart ofbusiness
have no business doing something — idiom
1. to do something that you have no right to do, or that is not your responsibility
1.idiom
Definition
to do something that you have no right to do, or that is not your responsibility.
Example
A six-year-old has no business riding that big motorbike around the yard.
Carlos had no business reading his sister's diary, and he knew it.