낫 놓고 기역자도 모른다

Literal Meaning

Lay down a sickle and still not recognize the letter ㄱ.

Usage

Used to describe a very ignorant person.

The Korean proverb suggests that if a person lays down a sickle and still cannot recognize the letter ㄱ, then that person is very ignorant since the shape of the letter ㄱ and a sickle are similar.

Korean Equivalent

아주 무식하다.

English Equivalent

Not know A from B.