neighbourhood watch
noun [ C or U ] UK (US neighborhood watch) uk/ˌneɪ.bə.hʊd ˈwɒtʃ/ us/ˌneɪ.bɚ.hʊd ˈwɑːtʃ/
居民联防，邻里守护制
a way of reducing crime by organizing the people who live in an area to watch each other's property and tell the police about possible criminals