Zi Collection, Upper Volume, Page 12, Entry 02 Radical: Mouth (kǒu) Pronounced tong (level tone) Also, in the "Jiyun" (Jiyun), pronounced dong (rising tone). Meaning: a hole in the ground that connects to another place. Zi Collection, Upper Volume, Page 12, Entry 03 Radical: Mouth (kǒu) Pronounced dong (rising tone) Meaning: a hole in the ground that connects to another place.