鞠躬尽瘁，死而后已 jūgōngjìncuìsǐ'érhòuyǐ to give one's all until death
(idiom) to work with total devotion and spare no effort until one's dying day; to spare no effort in the service of one's country or a cause until the day one dies; literally to bend to the task until worn out and only stop at death