Downcome \Down"come`\ (doun"k[u^]m`), n.
1. Sudden fall; downfall; overthrow. --Milton.
[1913 Webster]
2. (Iron Manuf.) A pipe for leading combustible gases
downward from the top of the blast furnace to the
hot-blast stoves, boilers, etc., where they are burned.
[1913 Webster]