The ~ are the public organizations whose job is to take quick action to deal with emergencies when they occur, especially the fire brigade, the police, and the ambulance service.
N-PLURAL: usu the N
EMERGENCY SERVICES
Meaning of EMERGENCY SERVICES in English
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012