狡兔死走狗烹
jiǎo​tù​sǐ​zǒu​gǒu​pēng

to discard someone after they have served their purpose

  1. 狡兔 jiǎo​tù
    crafty hare
    a cunning or crafty rabbit; used to describe someone who is shrewd or resourceful
  2. 死 sǐ verb
    to die
    to die; to pass away; to perish
  3. 走狗 zǒu​gǒu
    hunting dog
    (literary) a hound used for hunting
  4. 烹 pēng
    to boil to death
    An ancient judicial punishment or form of execution where a person was boiled to death in a large cauldron.