Off-Hand Parry

Two-Weapon Fighting (PH) , DEX 13, Base attack bonus +3, Ambidexterity, proficiency with weapon,

When fighting with two weapons and using the full attack option, you can on your action decide to attack normally or to sacrifice all your off-hand attacks for that round in exchange for a +2 dodge bonus to your AC. If you take this option, you also suffer penalties on your attacks as if you were fighting with two weapons. If you are also using a buckler, its AC bonus stacks with the dodge bonus. You can use only bladed or hafted weapons of a size category smaller than your own with this fear.

When fighting with two weapons and using the full attack option, you can on your action decide to attack normally or to sacrifice all your off-hand attacks for that round in exchange for a +2 dodge bonus to your AC. If you take this option, you also suffer penalties on your attacks as if you were fighting with two weapons. If you are also using a buckler, its AC bonus stacks with the dodge bonus. You can use only bladed or hafted weapons of a size category smaller than your own with this fear.

You use your off-hand weapon to defend against melee attacks.