四当五落

よんとうごらく

Also written ４当５落

Meanings

1. Expression sleep four hours and pass, sleep five hours and fail (when cramming for university entrance exams)

Kanji

• 四 four. Read as よん.
• 当 apply. Read as トウ.
• 五 five
• 落 fall. Read as ラク.

Jinuma: Japanese Dictionary · Word lists