Noun
debole (plural deboles)
In light swords, such as rapiers and modern weapons in the sport of fencing: that flexible part of the blade nearer the tip, as opposed to the more rigid part nearer the hilt.
However, some rapier masters divided the blade into three parts (or even a multiple of three), in which case the central third of the blade, between the forte and the debole, was often called the medio, mezzo or the terzo. Source: Internet
The debole, weak, is the part of the blade which includes the point and is the second half of the blade when the sword is divided into an even number of parts. Source: Internet