English version

be no/nobody’s fool

From Longman Dictionary of Contemporary Englishbe no/nobody’s foolbe no/nobody’s foolINTELLIGENTto be difficult to trick or deceive, because you have a lot of experience and knowledge about something Katherine was nobody’s fool when it came to money. fool
Examples from the Corpus
be no/nobody’s foolPerhaps he was, she was nobody's fool.
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