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

Downcome \Down"come`\, n.
   1. Sudden fall; downfall; overthrow. --Milton.

   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.