the south: the compass direction, or the side of something that faces it
This is the everyday word for south. It marks one of the four directions, and it shows up most often in lists that name all four together: north, south, east, and west. From there it stretches in two natural directions of its own.
First, it names the south side of a built thing: the south wall of the wilderness tent of worship, the south face of the great bronze basin in Solomon's temple, the southern edge of a tribe's land. Often the text adds a small ending that turns it into toward the south or on the south, so it points the eye in a direction rather than naming a place.
Second, late prophecy turns the plain direction into a political label. In the visions of Daniel, the king of the South is the ruler whose realm lay south of the holy land, that is, Egypt under its Greek dynasty, set against the king of the North. Here south is still the direction, just used to identify a kingdom by where it sat on the map.