underclass
noun [ C usually singular ] uk/ˈʌn.də.klɑːs/ us/ˈʌn.dɚ.klæs/
下层社会；下层阶级；贫困阶层
a group of people with a lower social and economic position than any of the other classes of society
The long-term unemployed now constitute a kind of underclass. 如今长期失业人员形成了贫困阶层。