not know someone from Adam

US /nɑt noʊ ˈsʌm.wʌn frəm ˈæd.əm/
UK /nɑt noʊ ˈsʌm.wʌn frəm ˈæd.əm/
"not know someone from Adam" picture
1.

to not know someone at all; to have no idea who someone is

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When the stranger approached me, I realized I did not know him from Adam.
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She claimed to be my cousin, but I did not know her from Adam.
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as far as someone knowsAdam's appleknowknow ofnot know B from a battledoreknow a hawk from a handsawfall from someone's lips