Deceiving Stance (3.5e Martial Artist Maneuver)
From D&D Wiki
You seemingly let your guard down, baiting in anyone foolish enough to attack
Level: Reactive 1
Description: By lowering your stance, you bait the enemy to attack. Anyone who does not make it past your AC, you may make one attack at your full attack bonus. At level 10 the number of attacks increases by one, and once more at level 20 for a grand total of three attacks. This stance does, however, lower your total AC by -2. At level 10, this deduction is lowered by one, to a final -1.
Special: Activating this stance is a swift action.