"Tang Yun" uses the characters "zhi" and "chi" for fanqie pronunciation, and "Ji Yun" uses "zhen" and "shi" for fanqie pronunciation. The pronunciation is the same as "zhi" (rising tone). "Shuowen Jiezi" explains it as: to expose, to attack. "Guang Yun" explains it as: to expose the evil deeds of others. Also, "Yupian" uses the characters "zhi" and "er" for fanqie pronunciation, and the pronunciation is the same as "zhi" (rising tone). The meaning is the same. Also, "Shuowen Changjian" writes it as (character form missing).