卸ㄒㄧㄝˋxiè磨ㄇㄛˋmò殺ㄕㄚshā驢ㄌㄩˊlǘ

  1. 將推完磨的驢子卸下來殺掉。比喻將曾經為自己辛苦付出者一腳踢開。如：「老闆不顧情面地逼退老幹部，卸磨殺驢的手段讓人心寒！」

英lit. to kill the donkey when the grinding is done (idiom)​, to get rid of sb once he has ceased to be useful