bounden duty
noun [ U ] old-fashioned or humorous uk/ˌbaʊn.dən ˈdʒuː.ti/ us/ˌbaʊn.dən ˈduː.t̬i/
不可推卸的责任
something that you feel you must do
She felt that it was her bounden duty to tell the police about the incident. 她觉得告诉警察那件事是她应尽的责任。