D defs.my
Entry 1 sense Webster, 1913

Breechblock

· Breech·block · IPA
01 n. The movable piece which closes the breech of a breech-loading firearm, and resists the backward force of the discharge. It is withdrawn for…
  1. 1.
    The movable piece which closes the breech of a breech-loading firearm, and resists the backward force of the discharge. It is withdrawn for the insertion of a cartridge, and closed again before the gun is fired.