Definition of "underclass"

The two are immediately caught up in a terrorist plot to rid the earth of its underclass, and this gives Nobby the chance to live out a James Bond fantasy of Englishness, with his own lager-swilling twist.

2016 February 23, Robbie Collin, “Grimsby review: ' Sacha Baron Cohen's vital, venomous action movie'”, in The Daily Telegraph (London)

While there are reasons to be optimistic about this trend, there is also something queasy about the emergence of a new underclass of urban servants.

2019 August 12, Derek Thompson, “America's Hot New Job Is Being a Rich Person's Servant”, in The Atlantic‎