n.

the time that the curfew signal is sounded

a signal (usually a bell) announcing the start of curfew restrictions

an order that after a specific time certain activities (as being outside on the streets) are prohibited

Curfews
Curfews
Curfews
Curfews and Delinquency in Major American Cities
The Effectiveness of Juvenile Curfews at Crime Prevention
Scared of the kids? Curfews, crime and the regulation of young people
Night driving curfews in New York and Louisiana: results of a questionnaire survey.
Juvenile Curfews and the Courts: Judicial Response to a Not-So-New Crime Control Strategy
Scheduling truck shipments of hazardous materials in the presence of curfews
Surveillance and Confinement: Explaining and Understanding the Experience of Electronically Monitored Curfews