Source : Webster's Revised Unabridged Dictionary (1913)

Scup \Scup\, n. [D. schop.]
   A swing. [Local, U.S.]

Scup \Scup\, n. [Contr. fr. American Indian mishc[`u]p, fr.
   mishe-kuppi large, thick-scaled.] (Zo["o]l.)
   A marine sparoid food fish ({Stenotomus chrysops}, or {S.
   argyrops}), common on the Atlantic coast of the United
   States. It appears bright silvery when swimming in the
   daytime, but shows broad blackish transverse bands at night
   and when dead. Called also {porgee}, {paugy}, {porgy},
   {scuppaug}.

   Note: The same names are also applied to a closely allied
         Southern species. ({Stenotomus Gardeni}).

Source : WordNet®

scup
     n 1: flesh of fish found in colder waters of northern Atlantic
          coast of the United States
     2: lean flesh of fish found in warm waters of southern Atlantic
        coast of the United States [syn: {porgy}]
     3: porgy of southern Atlantic coastal waters of North America
        [syn: {southern porgy}, {southern scup}, {Stenotomus
        aculeatus}]
     4: found in Atlantic coastal waters of North America from South
        Carolina to Maine; esteemed as a panfish [syn: {northern
        porgy}, {northern scup}, {Stenotomus chrysops}]