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Meaning of 'Not born yesterday'

What does the saying 'Not born yesterday' mean?

Idiom: Not born yesterday

Meaning:

When someone says that they weren't born yesterday, they mean that they are not naive or easily fooled.
Country: International English | Subject Area: Time | Usage Type: Both or All Words Used
All idioms have been editorially reviewed. Submitted idioms may have been edited for correctness and completeness.
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