each time perform an action

[Nodisplay]

what does it mean?
any skill use? any skill use + movement? any key press?

[Nodisplay]

many skills use this option but seems that nobody has ever thought what does it mean "each action" ?

[Ticklepink]

I would think it means an assaulting action but it probably means healing too..don't know though.

[Yasashiku]

It means anytime you are using a skill. That means anything and everyone other than auto-attack counts as an action. At least I'm pretty sure that's what it means.