Once More (コンボリーヴ, Konbo Rīvu?, lit. "Combo Leave"), also translated as Withstand Combo, is an ability introduced in Kingdom Hearts II. It allows the user to retain 1 HP after being attacked by a combo that would normally finish them off, provided they have more than 1 HP beforehand.
Once More is invaluable for facing certain bosses, particularly those that attack quickly and relentlessly.
Learning Once More
Kingdom Hearts II
Kingdom Hearts Birth by Sleep
Kingdom Hearts Re:coded
Kingdom Hearts 3D: Dream Drop Distance
Kingdom Hearts III
Kingdom Hearts 0.2 Birth by Sleep -A fragmentary passage-
Aqua will survive combo hits with 1 HP by default.