the upper crustnoun [ S, + sing/pl verb ]uk /ˌʌp.ə ˈkrʌst/ us /ˌʌp.ɚ ˈkrʌst/ informal
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(Definition of “the upper crust” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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to make a surface shiny by putting a liquid substance onto it and leaving it or heating it until it dries