It's in the Definition.
Moved
When your ball at rest has left its original spot and come to rest on any other spot, and this can be seen by the naked eye (whether or not anyone actually sees it do so).
This applies whether your ball has gone up, down or horizontally in any direction away from its original spot.
If your ball only wobbles (sometimes referred to as oscillating) and stays on or returns to its original spot, your ball has not moved.
