(also prep·pie ) / ˈprepi; NAmE / noun
( pl. -ies ) ( NAmE , informal ) a young person who goes or went to an expensive private school and who dresses and acts in a way that is thought to be typical of such a school
► prep·py (also prep·pie ) adjective :
a preppy image
preppy clothes
For more information see the Cultural Guide
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WORD ORIGIN
early 20th cent.: from prep school + -y .