marked man/woman
noun [ C usually singular ] uk/ˌmɑːkt ˈmæn/ us/ˌmɑːrkt ˈmæn/
被监视的人，处于危险中的人
someone who is at risk of being harmed by someone
He is still free to travel the world, but he knows that he is a marked man. 他仍可在世界各地自由旅行，但他知道自己已经被盯上了。