Definitions from Wiktionary (upper crust)

▸ noun:  (idiomatic, usually with the) The social elite, the highest social class.
▸ noun:  Used other than figuratively or idiomatically: see upper, crust. The topmost layer of a bread, pastry dish, or other item with a hardened coating.
▸ adjective:  Alternative form of upper-crust [(idiomatic, informal) Posh, upper-class; pertaining to the upper crust.]
▸ Also see upper_crust

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