韋編三絕 [韦编－绝]

Jyutping wai4 pin1 saam1 zyut6
Pinyin wéi biān sān jué

Definitions (CC-CEDICT)
  1. lit. the leather binding (of the bamboo scroll) has broken three times
  2. fig. to study diligently
Definitions (Wiktionary)
  1. phrase, figuratively, idiomatic
    to study diligently