The Collaborative International Dictionary
non-U vulgar
low-class \low-class\ adj.
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Occupying the lowest socioeconomic position in a society. Contrasted with middle-class and upper-class. [Narrower terms: propertyless, wage-earning, working-class, blue-collar] Also See: lowborn, proletarian, propertyless.
Syn: lower-class (vs. upper-class).
characteristic of the lower classes. [Narrower terms: non-U, vulgar] PJC]