mason-dixon line n the boundary between Maryland and Pennsylvania; symbolic dividing line between North and South before the American Civil War Synonym(s) Mason-Dixon line Mason and Dixon line Mason and Dixon's line
News & Articles mason-dixon line An outing of secrets we all keep The mysteries of every Southern family depend on secrets being kept. Any fiction writer born below the Mason-Dixon Line knows this. June 16, 2013 - St. Joseph News-Press