know one's ass from one's elbow

Verb

Synonym of know one's ass from a hole in the ground

Japanese Meaning

物事の違いを正確に判断し、区別する能力があること / 何が何であるかをはっきり認識できること / 対象や状況を正確に見分けられること

He doesn't know one's ass from one's elbow when it comes to cooking, so he burns everything.

料理に関してはまったく分からないので、何でも焦がしてしまう。

Sense（1）

Synonym of know one's ass from a hole in the ground

knows one's ass from one's elbow

（ present singular third-person ）

knowing one's ass from one's elbow

（ participle present ）

knew one's ass from one's elbow

（ past ）

known one's ass from one's elbow

（ participle past ）