How does the relentless pursuit card work?

Not sure what this does tbh as I'm a little confused as to what "ready your attack" actually means

The player that is on the attacking turn have an attack token (it's a glowing orange sword on the right of the board) that will be expended after declaring an attack with at last a minion. If you can refresh it after having already attacked, you get another chance to attack.

If you "ready your attack"  when you're the defending player, you still get the chance to declare an attack.

Ty, much apprecieted lightspoon