underclass

下层阶级、底层阶级、弱势阶层常与 the 连用

The report warns that a permanent underclass is forming in big cities.

报告警告，大城市里正在形成一个长期的下层阶级。

低年级学生美式

Most of the team's scoring came from the underclass this season.

这一季球队的得分大多来自低年级学生。

下层阶级的、底层的多作定语

The novel portrays underclass families struggling to pay rent.

这部小说描写底层家庭为了付房租而苦撑。