A unit that Gives Ground does so reluctantly, maintaining its formation whilst attempting to put a bit of much needed distance between itself and the enemy.
When a unit Gives Ground, it moves 2" directly away from the enemy unit or units that caused it to Give Ground, without turning, pivoting or otherwise changing its facing in any way, stopping immediately should it come into contact with another unit or terrain, or if continuing to move would bring it within 1" of an enemy unit.