Upper Crust Definition
    noun
  
 Webster's New World 
The highest social class or group.
 American Heritage 
Synonyms: 
  
    adjective
  
 (idiomatic, informal) Posh, upper-class; pertaining to the upper crust.
An upper-crust London party.
They're aiming for a more upper-crust clientele.
 Wiktionary 
Other Word Forms of Upper Crust
Noun
Singular:
 upper crustPlural:
 upper-crustsOrigin of Upper Crust
First known use as an idiom: 1836.
From Wiktionary
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