Guangyun uses the fanqie pronunciation of zhū. Jiyun uses the fanqie pronunciation of yáng zhū. The pronunciation is the same as "yú". Yùpiān states it is the sound of sighing. It is also stated to be the cry of a young pig. Furthermore, Guangyun records it as the name of a wild animal. Additionally, Jiyun explains one interpretation as yī wū, referring to a puppy.