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Definition of the upper crust noun from the Oxford Advanced Learner's Dictionary

the upper crust

noun
 
/ði ˌʌpə ˈkrʌst/
 
/ði ˌʌpər ˈkrʌst/
[singular + singular or plural verb] (informal)
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  1. the people who belong to the highest social class synonym aristocracy
    • The upper crust is/are willing and able to spend a huge amount on their children's education.
See the upper crust in the Oxford Advanced American Dictionary
trait
noun
 
 
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B2
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