reinvent Idiom, Proverb

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Reinvent the wheel

If someone reinvents the wheel, they waste their time doing something that has already been done by other people, when they could be doing something more worthwhile.

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reinvent

reinvent
reinvent the wheel
1) To do something again, from the beginning, especially in a needless or inefficient effort: “School districts need not reinvent the wheel every time they try to improve their schools” (Washington Post).
2) To recast something familiar or old into a different form: “Call it reinventing the wheel or recasting old ideas, but these contemporary versions have a spirit and style all their own” (New York Times).