English Dictionary

know one's ass from a hole in the ground

動詞

慣用表現 卑語

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

日本語の意味

一定以上の知識や技能を持ち、自分の言動や話題について十分理解していること / 自分の能力や状況を的確に把握し、適切な判断や行動ができる状態

To know one's ass from a hole in the ground is the minimum qualification for that job.

その仕事に就くための最低条件は、最低限の知識や技能があることだ。

意味（1）

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

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.

knows one's ass from a hole in the ground （ present singular third-person ）

knowing one's ass from a hole in the ground （ participle present ）

knew one's ass from a hole in the ground （ past ）

known one's ass from a hole in the ground （ participle past ）