よんとうごらく 四当五落 LinksSentence search for 四当五落Sentence search for よんとうごらくSentence search for 4当5落Kanji details for 四, 当, 五 and 落Edit in JMdict Expressions (phrases, clauses, etc.)1. sleep four hours and pass, sleep five hours and fail (when cramming for university entrance exams)Other forms4当5落 【よんとうごらく】 Discussions Log in to talk about this word.