the upper crust
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Fig. the higher levels of society; the upper class. (From the top, as opposed to the bottom, crust of a pie.) Jane speaks like that because she pretends to be from the upper crust, but her father was a miner. James is from the upper crust, but he is penniless.
The highest social class, as in She wanted badly to be one of the upper crust but it wasn't going to happen. This term alludes to the choicest part of a pie or loaf of bread. [First half of 1800s]
the upper crust
The upper crust are the people who belong to the highest social class. The Cowes Regatta is a gathering of the wealthy and the upper crust who race their huge yachts and attend grand parties.
the upper crustthe aristocracy and upper classes. informal
In Anne Elizabeth Baker 's Glossary of Northamptonshire Words and Phrases ( 1854 ) ‘Mrs Upper Crust’ is explained as the nickname for ‘any female who assumes unauthorized superiority’. The term was also current in informal American speech in the mid 19th century. The French word gratin has a similar pair of literal and metaphorical senses, being literally ‘a crust of crumbs and cheese on top of a cooked dish’ and metaphorically ‘the highest class of society’.
the ˌupper ˈcrust(informal) people who are in the highest social classIn the past, the top or upper crust of a loaf of bread was the best part, which the more important members of the household ate.
The top level of society. Although you might think that “crust” refers to bread and that the upper part was reserved for the aristocracy, word detectives would say you're wrong: no authoritative written connection between bread and the well-bred can be found. “Crust” refers to the earth's crust, or top layer. The upper crust of a society is its top layer.