The first phase of building a swing is to get the club moving back so that it's parallel to the ground - at 9 o'clock. Then moving through to a mirror image on the other side at 3 o'clock. There is very little wrist movement at this stage.

Moving through phase 1, phase 2 gets the arms parallel to the ground and the club points up at 12 o'clock. The reverse is true on the other side of the swing, like Phase 1.

Once the back swing is fully wound up, its combining simultaneously a slight lateral movement and a rotational movement which unwinds the swing through impact.