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quit while one's ahead

Don't try to improve on something that is already accomplished, as in Those drapes we hung are even enough—let's quit while we're ahead. This idiom also implies that further action runs the risk of spoiling something. Also see leave well enough alone.

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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.