资料来源 : Webster's Revised Unabridged Dictionary (1913)

Old Line State \Old Line State\
   Maryland; a nickname, alluding to the fact that its northern
   boundary in Mason and Dixon's line.

资料来源 : WordNet®

Old Line State
     n : a Mid-Atlantic state; one of the original 13 colonies [syn:
         {Maryland}, {Free State}, {MD}]