悬梁刺股

Explanation: Study hard to describe. 　　Usage: Combined; attributive; describe assiduous study 　　Source: Western Han Liu Xiang, "Qin Warring States policy a" (Su) reading drowsiness, cited cone stabbed its shares, the blood flow to the foot. "Han Ban" Han "Sun Jing Bao word text, studious, Chen Xi endlessly. Exhausted sleep sleep sleep up to tethered head, hanging beams." 　　Examples: I - year after year, the copper bird worn. ★ Qing Li Yu, "flounder · gift line" Thesaurus:  Xuantou Cigu