Chou Collection, Upper Volume Radical: Mouth (kǒu) 14 strokes Page 204, Entry 43 Pronounced kai (falling tone). Shuowen Jiezi (Explaining Graphs and Analyzing Characters): A sigh. Book of Odes (Shijing), Odes of Wang: Sighing heavily. Explication of the Classics (Shifa): The character is also pronounced ai. It is also used interchangeably with the character kai (falling tone). Book of Odes (Shijing), Odes of Cao: I wake and sigh in grief. Yupian (Jade Chapters): Cites the form as the main character. Also pronounced ke (entering tone). Also pronounced kai (third tone). The meaning is the same.