not know one's ass from one's elbow

idiom

Definition of not know one's ass from one's elbow

chiefly US, informal + impolite

: to know nothing : to be stupid Don't take his word for it—he doesn't know his ass from his elbow.

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Dictionary Entries near not know one's ass from one's elbow

not just/only/merely

not know beans about

not know one's arse from one's elbow

not know one's ass from one's elbow

not know one's own strength

not know someone from Adam

not know the first thing about

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