watchman
/ˈwɒtʃmən/noun
(pl. -men /-mən/)
1- a man employed to look after an empty building, especially at night（尤指雇来在夜晚看守大楼的）看守人。
1.1
- historical a member of a body of people employed to keep watch in a town at night〈史〉巡夜人, 值夜人。