不成功便成仁不成功则成仁bù chéng gōng biàn chéng rén

success or death; succeed or die (with honour)
❍ 马匪滚了几个滚又爬起来，手握短剑，这是匪徒最后的武器，上刻着“不成功则成仁。……”等字样。(曲波《林海雪原》586) After rolling a few turns Ma crawled to his feet. In his hand was a dagger—the bandit’s last weapon. On it was inscribed: “Succeed or die with honour…”