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The Collaborative International Dictionary
non-U vulgar

low-class \low-class\ adj.

  1. 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).

  2. characteristic of the lower classes. [Narrower terms: non-U, vulgar] PJC]