Meaning of the word "not know someone from Adam" in English

What does "not know someone from Adam" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

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

Idiom

1.

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

Example:
When the stranger approached me, I realized I did not know him from Adam.
She claimed to be my cousin, but I did not know her from Adam.
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