卸磨杀驴

lit. to boil the hound once it caught the rabbit (idiom); fig. to get rid of sb once he has served his purpose

lit. the birds are over, the bow is put away (idiom); fig. to get rid of sb once he has served his purpose

lit. to destroy the bridge after crossing the river (idiom); fig. to abandon one's benefactor upon achieving one's goal

lit. to kill the chicken to get the eggs (idiom); fig. to kill the goose that lays the golden eggs

lit. to drain the pond to get at the fish (idiom); fig. to kill the goose that lays the golden eggs