借尸还魂

jiè shī huán hún

lit. reincarnated in sb else's body (idiom); fig. a discarded or discredited idea returns in another guise

借

jiè

variant of 借[jie4]

尸

shī

(bound form) corpse

还

huán

to pay back

魂

hún

soul; spirit; immortal soul (that can be detached from the body)