sword-breaker

noun2

1. •
   A short sword or dagger with a deeply notched or toothed blade, or with secondary projections, designed to catch or grapple an opponent's weapon.

   • The deepest indentations are in the so-called Sword-breakers (brise-épées), mostly of the fifteenth century. — 1884
2. •
   A notch or projection on a dagger, etc., designed to catch an opponent's weapon.