Definitions for upper crust
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Random House Webster's College Dictionary
up′per crust′(n.)
Informal. the highest social class.
Category: Informal
Origin of upper crust:
1830–35
Princeton's WordNet
upper class, upper crust(noun)
the class occupying the highest position in the social hierarchy
Wiktionary
upper crust(Noun)
The topmost layer of a bread, pastry dish, or other item with a hardened coating.
upper crust(Noun)
The social elite.
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"upper crust." Definitions.net. STANDS4 LLC, 2013. Web. 21 May 2013. <http://www.definitions.net/definition/upper crust>.