Chou Collection, Lower Volume Radical: Big (dà) Page 250, Entry 08 Pronounced yun (rising tone). According to the Book of Sounds and Meanings (Guangyun) and the Collected Rimes (Jiyun), the pronunciation is yun (rising tone). According to the Explaining Graphs and Analyzing Characters (Shuowen), it means big. Another definition says it means high. According to the Commentary on the Classic of Original Potentials (Yuanbao Jingzhuan), when observing its phrasing, it is then vast and not reached.