私行 Traditional form: 私行 Pinyin (reading): sīxíng Definitions: to travel on private business to act without official approval to inspect incognito to act in one's own interest Characters: 私 - personal, private, secret; selfish 行 - to go, to walk, to move; professional Traditional characters: 私 - personal, private, secret; selfish 行 - to go, to walk, to move; professional