A long, single-edged samurai sword with a slightly curved blade, worn slung from the belt.
〈史〉（日本）太刀（挂在腰带上的微弯的单刃长刀）
Example sentencesExamples
These seemed much better suited to slicing cuts inflicted from horseback, and so the Japanese tachi, which had previously been modeled on the continental sword, was revised for the same effect.
He saw katanas, tachis, staffs, naginatas, throwing knives, darts and throwing stars as well.
You have decent arm strength, but you should use a tachi.
Furthermore, the term jujutsu was also sometimes used to refer to tactics for infighting used with the warrior's major weapons: ken or tachi, yari, naginata, and bo (staff).