lower-class vs middle-class vs upper-class low-class

from The Collaborative International Dictionary of English v.0.48
non-U \non-U"\ (n[o^]n*[=u]"), adj.
   Not characteristic of the upper classes especially in
   language use. [Chiefly British] [Narrower terms: {lower-class
   (vs. middle-class) (vs. upper-class), low-class}]

   Syn: vulgar.
        [WordNet 1.5]
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