Guangyun (Guangyun) states the pronunciation is kuo. Jiyun (Jiyun) states the pronunciation is huo, which sounds identical to the character for expansive. It refers to the sound of knocking or tapping. Guangyun records that this character is identical to the character for the sound of exhaling (fun). For a detailed explanation, please refer to the entry for the character for the sound of exhaling (fun). Additionally, Jiyun states the pronunciation is guo, which sounds identical to the character for outer city wall. It means the act of blowing air.