Definition of arme blanche in English:

arme blanche

Pronunciation /ˌɑːm ˈblɒ̃ʃ/

noun

historical Military
  • Frequently with the. Any of various weapons having a sharpened metal point or blade, as a pike, lance, sword, etc., especially one used by cavalry. Hence in extended use: cavalry; mounted troops.

    Frequently opposed to firearm.

Origin

Late 18th century. From French arme blanche from arme weapon + blanche, feminine of blanc white.