ㄨㄟˊㄈㄨˊwéifú

wēifúㄨㄟ ㄈㄨˊ
  1. 帝王官員外出為了避免暴露身分百姓服裝

(of a high-ranking official)​ to wear plain clothes in order to go about incognito
en civil, incognito