Definition of underclass noun from the Oxford Advanced Learner's Dictionary

 

underclass

 noun
noun
BrE BrE//ˈʌndəklɑːs//
 
; NAmE NAmE//ˈʌndərklæs//
 
[singular] Poverty and famine
 
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a social class that is very poor and has no status The long-term unemployed are becoming a new underclass. See related entries: Poverty and famine
See the Oxford Advanced American Dictionary entry: underclass