\Spring"ing\, n.
1. The act or process of one who, or that which, springs.

2. Growth; increase; also, that which springs up; a shoot; a
   plant.

         Thou blessest the springing thereof.  --Ps. lxv. 10.

{Springing line of an arch} (Arch.), the horizontal line
   drawn through the junction of the vertical face of the
   impost with the curve of the intrados; -- called also
   {spring of an arch}.