In Aeon of Storms, the act of disengaging is when you do everything in your power to stop an teamfight from taking place at that very moment. This can be done via certain hero's abilities.
A disengage can be helpful if your team has a split pusher and is pushing towers while the enemy is trying to fight the rest of your team. Having disengages is crucial in making sure that your team comes out ahead in this situation considering it is difficult to win a 4v5 normally.
Sometimes a disengage is necessary if you are using a poke comp. In this situation, it is crucial that you do not fight until the opponents are very weak.
Ways to Disengage
Several heroes have the ability to disengage teamfights well. Some include but are not limited to:
Each of these heroes have either an escape mechanism that they can use to run away or slows so that they can run away from teamfights.