Zi Collection, Page Position: Lower. Radical: Mouth (kǒu). Page 189, Entry 03. According to the Tang Rhymes (Tangyun), it is pronounced kuai (falling tone). According to the Collected Rhymes (Jiyun), it is pronounced kuai (falling tone), and the pronunciation is the same as kuai. The Erya: Interpretation of Ancient Terms (Erya Shigu) explains that this term refers to breath or breathing. The commentary states that this term describes the appearance of breathing. Additionally, according to the Collected Rhymes (Jiyun), it is pronounced kui (falling tone), which is the same as kui, indicating the meaning of a deep sigh.