吃粉筆末

Simplified: 吃粉笔末

chīfěnbǐmò ㄔ ㄈㄣˇ ㄅㄧˇ ㄇㄛˋ

    • to work as a teacher

Character by character

Saying俗语俗語

Idiom惯用语 · Rarely used now

Literally
eat chalk dust
Meaning
To work as a teacher. Wry, humorous.

Sources