How do you say parrying a sword by slashing your sword on that sword? You know you can block a sword attack by blocking the slash with your swinging your sword at it. Is there a particular word for blocking a sword attack with a sword attack?
"Parry" is the correct term to for defensive move against a fencing attack. However, I wouldn't say it is widely used outside the sport.
If you're looking for an informal, everyday term for the swords hitting together I would say that the two swords "clashed". The word 'clash' literally means to collide with a loud, harsh, usually metallic noise, and through use linked with sword fights it has also come to also mean any kind of fight.