背恩弃义

Explanation: Means for their gratitude, to live up to others. With the "back en Wang Yi." 　　Source: Han Huan Kuan, "Salt and Iron did not pass": "anti-labor people themselves, people still back the far exiled ex abandoned righteousness." 　　Examples: Conversely, losing the revolutionary tradition, the people ~, a wide face to change, riding on the lord it over people's heads, it is cursed by the people. ★ Guan Hua "on the reply" Thesaurus:  fail to live up to one's benevolence and loyalty(relationship)