curfew
/ˈkɜːfjuː/noun
1- a regulation requiring people to remain indoors between specified hours, typically at night（多指夜间的）宵禁; 戒严：
a dusk-to-dawn curfew
傍晚至黎明的宵禁
mass noun the whole area was immediately placed under curfew.整个地区立刻处于戒严状态。
1.1
- the hour designated as the beginning of such a restriction宵禁起始时间：
mass noun to be abroad after curfew without permission was to risk punishment.不经允许在宵禁后出门可能会受处罚。
1.2
- the daily signal indicating this宵禁信号。
词源
Middle English （denoting a regulation requiring people to extinguish fires at a fixed hour in the evening, or a bell rung at that hour）： from Old French cuevrefeu, from cuvrir 'to cover' + feu 'fire'. The current sense dates from the late 19th cent.