There is the word "Tsubazeriai" from which the tsuba became the origin of a word. this -- a partner's sword -- Tsuba-- it means "fighting for victory or defeat fiercely" from pushing one another, caught by origin.

A sword guard (Tsuba) is a name of what protects the hand which inserts between the handle of a sword, and a blade and grasps a handle. A hole is made in the center, and on both sides of the upper and lower sides of a sword guard, it is crowded with two-sheet the board of a set of thin metal which gives through and a handle to this and is called Seppa to it in a blade, and is used with it, fixing.
size versatility , such as a Sinmaru form , a Aori form , a square shape, anda Mokko form .

 * This text is quoted from WIKIPEDIA.