Guard (ガード Gādo) refers to the defense system in the Tekken games. You guard in the Tekken series by holding the down the direction opposite to your opponent- this is called a Standing Guard. Holding back and diagonally down results in a Crouch Guard. The player will also guard if they are standing still, called a Neutral Guard.
Although guard is a defensive position, a Standing Guard can be broken by a Throw, a low attack or an unblockable. A Crouch Guard can be broken by a mid attack or a low throw. Neutral Guards have the same weaknesses as Standing Guards but can also be broken by certain combos and hard hitting moves.
The player can choose to receive a small amount of damage while guarding, called chip damage, through the Options menu in some games.