鞠躬尽瘁，死而后已

jū gōng jìn cuì , sǐ ér hòu yǐjugongjincui,sierhouyi

1. to bend to a task and spare no effort unto one's dying day (idiom); striving to the utmost one's whole life
2. with every breath in one's body, unto one's dying day

Study it in Yanamino