走馬上任 [－马－－]

Jyutping zau2 maa5 soeng5 jam6
Pinyin zǒu mǎ shàng rèn

Definitions (CC-CEDICT)
  1. (idiom) to take office; to assume a post
Definitions (粵典–words.hk)
  1. 動詞
    接替​其他人​擔任​某​一個​職位
    to assume an office