Tang Rhymes (Tangyun): Pronounced bo. Collected Rhymes (Jiyun): Pronounced bo. Explanation of Writing and Analysis of Characters (Shuowen Jiezi) defines it as the appearance of chewing. Broad Rhymes (Guangyun) states that this is the appearance of chewing. The original text in Collected Rhymes (Jiyun) was written in a variant form, meaning to chew, used to describe hardness. Sometimes also written in a variant form. Also, in Collected Rhymes (Jiyun): Pronounced po. The meaning is the same.