the time that the curfew signal is sounded(noun.time)
source: wordnet30
a signal (usually a bell) announcing the start of curfew restrictions(noun.communication)
source: wordnet30
an order that after a specific time certain activities (as being outside on the streets) are prohibited(noun.communication)
source: wordnet30
The ringing of an evening bell, originally a signal to the inhabitants to cover fires, extinguish lights, and retire to rest, -- instituted by William the Conqueror; also, the bell itself.(noun)