the onus
noun [ S ] formal uk/ˈəʊ.nəs/ us/ˈoʊ.nəs/
责任；义务
the responsibility or duty to do something
[ + to infinitive ] The onus is on the landlord to ensure that the property is habitable. 房东有责任保证房子适宜居住。
We are trying to shift the onus for passenger safety onto the government. 我们正在试图把保证旅客安全的责任交给政府。