not know someone from Adam

idiom

Definition of not know someone from Adam

informal
: to have never met with someone : to not know someone at all Why should she trust me? She doesn't know me from Adam.

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“Not know someone from Adam.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/not%20know%20someone%20from%20Adam. Accessed 11 December 2019.

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