From Longman Dictionary of Contemporary Englishfinishing schoolˈfinishing ˌschool noun [countable] SESa private school where rich girls go to learn social skills
Examples from the Corpus
finishing school• Happened straight after finishing school in Vienna.• You know that she read archeology by correspondence when she was at finishing school.• In 1863 the family settled in London, where Charlotte attended finishing school.• Her roommate, Elinor McLane, was going to finishing school in Florence. 