Definition
A swing is a lateral throw across the field — typically handler-to-handler — that moves the disc from one sideline or hash to the other. It does not gain ground but it changes everything else: the Force flips, downfield defenders have to rotate, and lanes that were closed open up.
In Context
The swing is how we punish a settled defence. When the disc has been on one side for long enough that defenders have stopped expecting movement, a swing pulls the entire shape sideways and exposes the Break Side of the new picture before the defence catches up.
Swings are normally set up by a Reset — disc back to the Dump Handler, then across to the Secondary Handler or another central handler — but they can also come live, off the catch, when the Active Handler sees a clear lateral lane.
A swing followed by a Strike Cut or a deep look is one of the highest-percentage attacking sequences in our offence — see Expansive - Deep Game. The defender who was respecting the open side is now the break-side defender, and they have not yet adjusted.