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eyes are bigger than one's stomach, one's

Someone wants more than he or she can handle, as in He's thinking of acquiring a third business, but we think his eyes are bigger than his stomach. This expression alludes to someone taking more food than he or she can digest. [Late 1500s]

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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.