Definition of 四当五落 (よんとうごらく)
よんとうごらく
                        四当五落
よんとうごらく
yontougoraku
expression
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sleep four hours and pass, sleep five hours and fail (when cramming for university entrance exams)(yojijukugo)
Other readings:
                4当5落【よんとうごらく】
                Related Kanji
| 四 | four | 
| 当 | hit, right, appropriate, himself | 
| 五 | five | 
| 落 | fall, drop, come down, village, hamlet |