最終更新日：2024/08/03

(idiomatic, vulgar) To have an adequate level of knowledge or skill; to understand what one is doing or talking about.

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know one's ass from a hole in the ground

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元となった辞書の項目

know one's ass from a hole in the ground

verb

I don't think he knows his ass from a hole in the ground.

意味（1）

"Why are you so sure and they aren't?" the landsman said. . . .

"Because Mr. Ricimer knows his ass from a hole in the ground, sir."