To waste time redoing work that already exists.
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To waste effort making something that already exists and works.
When you reinvent the wheel, you start from nothing even though a good solution is already available to copy or adapt.
It's usually said as advice, to save someone the wasted work.
"Back to Square One"
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Start over because your attempt failed
"Start From Scratch"
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Begin again from nothing, sometimes necessary
"Reinvent the Wheel"
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Redo work that already exists