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Idioms and Phrases with nobody's fool

nobody's fool

A person who cannot be duped or taken advantage of, as in You can't put anything over on Ryan—he's nobody's fool. [Early 1900s]

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