微服 [－－]

Jyutping mei4 fuk6
Pinyin wēi fú

Definitions (CC-CEDICT)

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

Definitions (Wiktionary)

verb, of the emperor or officials
to wear plain clothing when outside to avoid exposing one's official identity; to be in disguise

Definitions (Kaifangcidian)

（沒有對應漢語詞彙）