The Collaborative International Dictionary of English v.0.48:

black and blue \black and blue\, black-and-blue
\black-and-blue\adj.
   discolored by or as if by bruising; -- of skin. livid bruises

   Syn: livid.
        [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

black and blue \black and blue\ n.
   the dark color of a bruise in the flesh, which is accompanied
   with a mixture of blue. "To pinch the slatterns black and
   blue." --Hudibras.
   [1913 Webster] black-and-white