Zi Collection, Upper Volume, Page 23, Entry 01 "Book of Jade (Yupian)," "Rhyme Standard (Guangyun)," and "Rhyme Collection (Jiyun)" record this character as pronounced "yu jian qie," homophonous with "yan." It means to exert force when shouting loudly. It also refers to the abdomen swelling due to anger. Sometimes it is also written as "躽." Furthermore, "Rhyme Collection (Jiyun)" records this character as pronounced "yi dian qie," homophonous with "yan." It is also pronounced "yu tian qie," homophonous with "yan." The meaning is the same.