A two-part phrase (xiehouyu) meaning "to endure it"; the character [[忍|忍|ren3]] consists of a knife above the heart, implying that one must endure even the most painful of circumstances.

Literally there is a knife above the character for lust [[色|色|se4]]; used as a warning that indulging in sexual desire or lascivious behavior leads to disastrous consequences.