Broad Rimes (Guangyun) and Collected Rimes (Jiyun) state the pronunciation as cu, which is the same as the character for restricted or contracted. The Jade Chapters (Yupian) defines it as a sigh of regret, meaning feeling ashamed. Collected Rimes (Jiyun) defines it as the appearance of being bashful and uneasy. Some versions write it in a variant form (zhuan).