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.
A useless product which is advertised as being needed by everybody, but which in fact no one needs.
(slang, sometimes derogatory) A computer programmer.
Lack of attachment, especially freedom from attachment to worldly things or goals, as in some Eastern philosophies.
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