The word for today is…
curfew (noun):
1: the sounding of a bell at evening
2a: a regulation enjoining the withdrawal of usually specified persons (such as juveniles or military personnel) from the streets or the closing of business establishments or places of assembly at a stated hour
b: a requirement that someone (typically a child) be home by a particular time
c: a signal to announce the beginning of a curfew
d: the hour at which a curfew becomes effective
e: the period during which a curfew is in effect
Source : Merriam -Webster
Etymology : When curfew was first used in the 14th century, it referred to the sounding of a bell at evening to alert people that they should cover their hearth fires for the night—a necessary warning, as many European houses in the Middle Ages were close enough to each other that fires could spread easily from one to the next. The word came to English from Anglo-French, in which the signal was called coverfeu, a compound of covrir, meaning “to cover,” and feu, “fire.” Even when hearth fires were no longer regulated, many towns had other rules that called for ringing an evening bell, including one that required people to be off the streets by a given time, a development that granted curfew permission to go out and about with a broader meaning.
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