The difference between a blade and a double-edged sword.

 One of the most common questions on the Internet regarding knives is the difference between do and sword. Most people cite Muyedo Commonplace for this question, saying that the blade on both sides is a sword and the blade on only one side is a do. Of course, this story is not necessarily wrong. In the ordinary land of Muye Island, a double-edged knife was clearly called a sword and a single-edged knife was called a do. The double-edged sword is called "Gum" and the single-edged knife is called "Do" in the middle of martial arts, and "Gum and "Gum" and "Do" were used together. The reason why swords were revered in ancient times and Tao in later generations is not related to the sharp and dull differences in knives, but because everyone has the same habit." However, the Jungwon Pilbi compiled not far from ordinary martial arts has a different view on the difference between Tao and sword. In the old days, Do and Geom had different systems and different names. Do has a long handle and a blade and hair iron. The sword has a short sack, a long blade, and a sheath. Today, people do not distinguish between the long and short of the bag and the blade, the ring, the sheath, and the absence, and all are called Do. However, it is clear that Do is not a common serpentine, but a type of spear." In other words, the author of Yongwon Pilbi argues that the weapon with a sheath and a short blade is a sword, and the one with no sheath and a long sack is a do. Yong Won-pilbi's claim is based on the Mugyeong Chongyo of the Song Dynasty of China, and in fact, soldiers in the Mugyeong Chongyo, Unwoldo, Guldo, Bongchwido, Pildo, Kukdo, and Micheomdo are all classified as one day or both. Therefore, the claim of the loan fee is not without grounds. Then, which argument is correct? Historically, the single-edged Tao has already existed as a living tool since the Neolithic Age. Neolithic people cut meat and cut wood using Tww, but did not use it as a full-fledged weapon. When the first long-bladed combat weapon, or bronze sword, appeared in the Bronze Age, the Chinese called this new weapon the sword. This Chinese character, sword, is a combination of the letter "cheom" representing the phonetic value and the letter "do" meaning the blade. On the one hand, Cheom also symbolizes pointed things. At that time, there was no reason to be confused at all between the single-edged Tao used as a living tool and the double-edged sword used as a weapon.   However, in the era of the Han Dynasty, when Hwandudaedo Island, a single-edged sword, first appeared, the relationship between Do and Sword became quite ambiguous. Hwandu Daedo Island is definitely a combat weapon, so its function corresponds to a sword, but in the form of a blade, it corresponds to a single-edged sword. Therefore, from this point on, confusion arises in the use of the words do and sword. According to Hu Han-seo, citing Chunchu-gye written by Dong Joong-seo, "The sword is on the left, so it looks like a blue dragon, and the do is on the right, so it is clearly distinguished from the commentary." The fact that they tried to explain the difference between swords and Tao proves that the word "help sword" was already used in much of the generation of the Song Dynasty, when the latter was compiled. In fact, in the Song Dynasty's Mugyeongchongyo, all soldiers with several meters of sacks were called Do, and among them, Pildo and Dodo, two-edged weapons, were divided into Do. In Korea, which accepted Chinese characters from China, the words Do and Geom have been used interchangeably since the Three Kingdoms Period, and at that time, the word sword was more widely used than Do, even though most of the single-edged Hwandudaedo was used. And in the early Joseon Dynasty, the one-day military flag was even called Janggum. Therefore, China and Korea have historically used the words do and sword almost always, and there was no clear boundary between these two words. And the general claim of martial arts that a single-edged knife is a do and a double-edged knife is a sword is not necessarily correct. However, there is no distinction between these two words. Black is a combat-winged weapon, so it is never named a sword for living tools. On the other hand, since Do started from one-day living equipment, most of the weapons and living tools on one-day are named Do except in extremely exceptional cases. Even today, rather than trying to distinguish between swords and swords, all weapons with long blades are called swords, and it is right to use Do only for one blade, especially for swords.