reinvent the wheel
- (idiomatic) To do work unnecessarily when it has already been done satisfactorily by others; to attempt to devise a solution to a problem when a solution already exists.
2000 August 28, Dave Kearns, “Directory Services: Let's not reinvent the wheel”, Network World, volume 17, page 22:
- Evidently, the trend in security applications is to reinvent the wheel, or in this case, to reinvent the directory service.
to do work unnecessarily