The purpose of this technique is to drop the
opponent's hand, foot or weapon attacking the solar
plexus and point below. It is executed principally
from rear foot and L stances, though occasionally a
walking or vertical stance is used. The blocking tool
should reach its point of focus in a circular motion,
keeping the elbow bent about 45 degrees at the
moment of the block.  
Downward block
(Naeryo Makgi)