Chou Collection, Upper Volume Radical: Mouth (kǒu) Zuo Kangxi Stroke Count: 10 Page 192, Entry 23 According to the Ocean Collection (Pianhai), pronounced shi. It is the same as the word meaning to gnaw. According to the Haiyan Gazetteer (Haiyan tujing), when the tides of the ocean swell, if there are bubbles forming and bursting in the pot, the local people call this ocean zuo.