not know from Adam
to have never met someone and not know anything about them
not know someone from Adam
to not know someone at all

[TahlilGaran] Dictionary of Contemporary English ▲

not know from Adam
(not) know (someone) from Adam
to have never met someone and not know anything about them.
Why should I lend him money? I don't know him from Adam.

[TahlilGaran] English Idioms Dictionary ▲

not know from Adam
to not know someone at all
I did not know the man who came to our door from Adam.

[TahlilGaran] English Idioms Dictionary ▲

not know someone from Adam
(not) know (someone) from Adam
to have never met someone and not know anything about them.
Why should I lend him money? I don't know him from Adam.

[TahlilGaran] English Idioms Dictionary ▲

not know someone from Adam
to not know someone at all
I did not know the man who came to our door from Adam.

[TahlilGaran] English Idioms Dictionary ▲