NAME
        get_opposite_dir

SYNTAX
	string get_opposite_dir(string dir)


DESCRIPTION
	Returns opposite direction of the argument. E.g. "south"
	if dir is "north", "down" if dir is "up" etc.

	This is an sfun and might not be available.

SEE ALSO
	sfun/get_dir_abbrev, sfun/get_dir_expansion