Curfew (noun)

1. A regulation requiring people to remain indoors between specified hours, typically at night.
2. The time when such a regulation begins.
3. A signal indicating the start of a curfew.

Origin:

Origin: middle english (originally as a signal sounded by a bell): from old french cuevrefeu, from covrir ‘cover’ + feu ‘fire’ (from latin focus).

Examples:

1. The city imposed a curfew after the riots.
2. The curfew starts at 10 pm and ends at 6 am.
3. The sound of the curfew echoed across the deserted streets.