【刎颈之交】〖wn jng zh jio〗[Damon and Pythias; a friendship to the death; a friendship that would lead persons to die for each other; bosom friends who are willing to die for one another]

刎身赴义不容辞，

颈赤面红名顶替。

之死不渝共患难，

交相辉映忠烈士。

比喻可以同生死、共患难的朋友。metaphor for friends who can share with life and death. 同：患难之交。