Meaning of “underclass” in the English Dictionary

"underclass" in American English

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underclassnoun [ C ]

us /ˈʌn·dərˌklæs/

the lowest economic and social class in society, consisting of people who are considered to have few opportunities to improve themselves

(Definition of “underclass” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"underclass" in Business English

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underclassnoun [ C, usually singular ]

uk /ˈʌndəˌklɑːs/ us ECONOMICS

the poorest people in a society, especially when discussing their lack of opportunities to find work:

Letting guest workers into America doesn't create an underclass.
The nation needs to reduce the vast gap between the wealthy and a jobless underclass.

(Definition of “underclass” from the Cambridge Business English Dictionary © Cambridge University Press)