‖n. [ F., fr. cul back. ] The lower faceted portion of a brilliant-cut diamond. [ 1913 Webster ]
‖n. [ F. ] Also, sometimes, Anglicized (Ordnance) An accidental blowing off of, or other serious damage to, the breechblock of a gun; also, a removal of the breechblock for the purpose of disabling the gun. [ Webster 1913 Suppl. ]