enough is enough
One should be satisfied; stop, there should be no more. For example, No more speeches—enough is enough, or as Robert Southey put it (The Doctor, 1834): “As for money, enough is enough; no man can enjoy more.” This expression already appeared in John Heywood's proverb collection of 1546 and is often used as an interjection (first example).
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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.