Guangyun and Jiyun state that this character is pronounced "tu gan qie," similar to the character "dan." Shuowen Jiezi explains it as: congee and rice mixed together. Also, Guangyun states that this character is pronounced "tu han qie," similar to the character "tan." The meaning is the same. Also, Jiyun states that this character is pronounced "tu gan qie," similar to the character "dan." Cao san refers to dregs. Another explanation is mushy congee.