忍垢偷生 rěngòu-tōushēng
(1) [allow oneself to be insulted to remain alive] 忍受耻辱,苟且活命
妾恨不即死,止因未与将军一诀,故且忍垢偷生。——《三国演义》
(2) 亦作“忍辱偷生”