reinvent the wheel


Do something again, from the beginning, especially in a needless or inefficient effort, as in School committees need not reinvent the wheel every time they try to improve the curriculum. This expression alludes to the invention of a simple but very important device that requires no improvement. [Second half of 1900s]

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.