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not know one's arse from one's elbow
not know one's arse from one's elbow
01
to show a great lack of intelligence or poor judgment
Dialect
British
British![{not} [know] {one's} arse from {one's} elbow definition and meaning](https://cdn.langeek.co/photo/44844/original/?type=jpeg "{not} [know] {one's} arse from {one's} elbow definition and meaning")
Exemple
Don't take his word for it—he doesn't know his arse from his elbow.
