What is "downcome"

Downcome \Down"come`\ (doun"k[u^]m`), 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.

n. 1 A tumbling or falling down; a sudden or heavy fall; an overthrow; ruin; destruction. 2 In ironmaking, a pipe that leads combustible gases downward from the top of the blast furnace to the hot-blast stoves, boilers, etc., where they are burned. vb. To come down; fall down; come or fall apart.