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plural lower classes
A class of people in a society characterized by low incomes, low level of education, high unemployment and, as a result of these, a low social status. quotations examples
The only language of the lower class is pidgin-English—quite incomprehensible to the newcomer from Great Britain, —but a large proportion of the inhabitants are highly educated men who excel as lawyers, clergymen, clerks and traders.
1911, “Freetown”, in 1911 Encyclopædia Britannica