a principal pipe carrying water or gas to buildings, or taking sewage from them.
a faulty gas main
a match between fighting cocks.
At a big cockfight main with Massa Lea early during the 1824 season, Uncle Mingo heard from an old trainer he had known for years that a hackfight was due to be held that coming Saturday afternoon behind the large barn of a local plantation.
(in the game of hazard) a number (5, 6, 7, 8, or 9) called by a player before dice are thrown.