not know one's arse from one's elbow
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"not know one's arse from one's elbow"的定义和意义

not know one's arse from one's elbow
01

to show a great lack of intelligence or poor judgment

{not} [know] {one's} arse from {one's} elbow definition and meaning
example
Example
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Do n't take his word for it — he does n't know his arse from his elbow.
Not knowing his rase from his elbow, he stepped forward to lecture me.
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