駑馬戀棧 [驽马恋栈]

Jyutping nou4 maa5 lyun2 zaan6
Pinyin nú mǎ liàn zhàn

Definitions (CC-CEDICT)
  1. lit. a worn-out horse is reluctant to leave the stable (idiom)
  2. fig. a mediocre worker clings to a good position