Zi Collection, Upper Volume, Page 25, Entry 04 Pronounced xi (entering tone). From the "Book of Rhymes (Guangyun)": Pronounced xi (entering tone). From the "Collected Rhymes (Jiyun)": Pronounced xi (entering tone). The pronunciation is the same as "xi" (entering tone). From the "Elegance Lexicon (Boyya)": The characters "xi" and "xi" indicate extreme, limit. Another explanation is that it describes the appearance of being on the verge of death.