漆身吞炭
qī​shēn​tūn​tàn

to sacrifice oneself for revenge

漆身吞炭 qī​shēn​tūn​tàn
to sacrifice oneself for revenge
Literally "to paint one's skin and swallow charcoal"; describes sacrificing one's physical appearance or health in order to plan a hard-fought revenge or to repay a master's kindness, based on the story of the assassin 豫让 yù​ràng in the Warring States period

Cross-References

Has variant