The idiom "not know someone from Adam" likely has biblical origins and can be traced back to the story of Adam in the Book of Genesis. In this idiom, "Adam" represents the first human being, and not knowing someone from Adam implies a complete lack of familiarity or recognition. It is used to signify that the person is entirely unknown to the speaker, emphasizing their anonymity or obscurity in a given context.

What is the origin of the idiom "not know someone from Adam" and when to use it?

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to {not} [know|recognize] {sb} from Adam

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Definición y significado de "not know somebody from Adam"en inglés

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