"upper crust." YourDictionary, n.d. Web. 19 October 2018. <http://www.yourdictionary.com/upper-crust>.
upper crust. (n.d.). Retrieved October 19th, 2018, from http://www.yourdictionary.com/upper-crust
(plural upper crusts)
First known use as an idiom: 1836.
(comparative more upper-crust, superlative most upper-crust)
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