Inside Line

Definition

When both your sword and your opponent's sword are gripped solely in the right hand or with the right hand leading (in the case of a two handed weapon), the inside refers to Lines of Attack to the right of their sword.

This term comes from the fact that when a weapon is wielded one-handed it is generally held more to the right-side of one's body, thus having your sword to the right of your opponent's places it's point and edge generally inside the silhouette of the opponent's body, whereas being to the left of their sword would generally place your point and edge outside of their body.