死而后已
[词典] do one's best till one's heart ceases to beat; If that leads to death, so be it.; Only with death does one's course end.; to the end of one's days;
[例句]他真是鞠躬尽瘁,死而后已。
He really gave his all till his heart ceased to beat.
exert the utmost until death
until my heart stops beating