What they mean by waiting instead of you doing an action the round your turn was given, you have option to delay it to lets say, turn after your allies. Which is different to defend since it takes up your action.
Like this. Lets say we have a combat encounter with A(llies), E(nemies) and C(hampion).
Round start: CEEEAEEA (starting turn order).
Champion chooses to wait: so the turn order turns into EEEACEEA .
So in this scenario, enemies after the champion go first since they chose to wait, then their Ally then champion. This is all by the way I think it would work.
I am not really advocating for this since game already has problem with manual control over entier party just turning game into easy mod. This, while having some obvious risks to it, could still make game even more mind numbing.
Just wanted to explain what they ment.