Nail said:
"Action" is a very clearly defined game term. There are standard Actions, Full-round Actions, Free Actions, etc.
The phrase 'your action', however, is sometimes used in such a way as to imply 'your turn in the initiative order'.
(Combat Expertise) The changes to attack rolls and Armor Class last until your next action.
(Power Attack) On your action, before making attack rolls for a round, you may choose to subtract a number from all melee attack rolls and add the same number to all melee damage rolls.
(Stunning Fist) A defender who fails this saving throw is stunned for 1 round (until just before your next action).
(Delay) If you come to your next action and have not yet performed an action, you don’t get to take a delayed action (though you can delay again).
(Ready) If you come to your next action and have not yet performed your readied action, you don’t get to take the readied action (though you can ready the same action again).
(Shield Bash) If you use your shield as a weapon, you lose its AC bonus until your next action (usually until the next round).
If I use Stunning Fist on someone and walk away (move action), hasn't "just before my next action" already happened? Does it last for 1 round, or until just before my next action? How can it be both?
If I use my shield as a weapon and say "Gotcha!" (free action), do I regain my AC bonus?
If I use Combat Expertise and then cast Quickened True Strike (free action), do the bonus and penalty to AC and attack rolls expire?
If I Ready an action to 5-foot-step-and-attack when my buddy is in a flanking position, and yell "Ready!" (free action), do I not get to take the readied action?
If we read 'your action' as 'your turn', these problems go away.
-Hyp.