ㄗㄨㄛˋㄍㄨㄢㄔㄥˊㄅㄞˋzuòguān‑chéngbài

坐观成败
  1. 別人成功失敗採取冷眼旁觀態度 按兵不動坐觀成敗架勢」。

to sit and await success or failure (idiom)​; to wait to see the outcome of a fight before taking sides, to sit on the fence