preach to the choir
idiomPart ofchoir
preach to the choir — idiom
1. to share an opinion or idea with people who already agree with it, making the ef
1.idiom
Definition
to share an opinion or idea with people who already agree with it, making the effort unnecessary because no one needs convincing
Example
The principal was preaching to the choir when she told the science club that studying matters.
You are preaching to the choir about exercise — I already run three times a week.