兔死狗烹

tù sǐ gǒu pēng

lit. to boil the hound once it caught the rabbit (idiom)

fig. to get rid of sb once he has served his purpose

兔

tù

variant of 兔[tu4]

死

sǐ

to die

狗

gǒu

dog

烹

pēng

to boil; to brew (tea)