xiè mò shā lǘ
磨完东西后；把拉磨的驴卸下来杀掉。比喻把曾经为自己出过力的人一脚踢开。
刘绍棠《狼烟》：“只怕归队以后，打下萍水县城，他就得卸磨杀驴。”
卸磨杀驴连动式；作谓语、分句；含贬义。
get rid of somebody as soon as he has done his job
