"Tang Yun" uses "yi zhu" for pronunciation, and "Ji Yun" uses "yong zhu" for pronunciation, both pronounced like "yu" (rising tone). "Shuowen Jiezi" explains it as: the root cannot bear the tip, referring to weakness. "Liushu Gu" states: 㼌 refers to the abundance of melon fruits. Thus, it is extended to mean that the root cannot bear the tip. Additionally, "Yupian" explains it as: illness caused by fatigue.