Mao Collection, Lower Volume Radical: Tapping (pū) 斃 Kangxi stroke count: 18 Page 476, Entry 09 Collected Rimes (Jiyun): Pronounced pi (falling tone). Erya, Explanation of Words (Erya, Shiyan): Bi means to stumble or fall forward. Commentary: To fall face down. Book of Rites, Tan Gong (Liji, Tan Gong): He shot it and caused one person to fall dead. Commentary: Bi means to fall prostrate. Explanation of Text (Shiwen): Bi is also written in a variant form (bi).