living will
noun [ C usually singular ] uk/ˌlɪv.ɪŋ ˈwɪl/ us/ˌlɪv.ɪŋ ˈwɪl/
（关于病入膏肓时采取何种治疗手段的）事前遗嘱，生前遗嘱
a written document in which a person says what type of medical treatment they would like if they become so ill that they are certain to die and are unable to communicate their wishes about their treatment