The term tachi (kanji: 太刀) means "great sword" in English. It is written たち in hiragana. It's pronounced roughly like "tah-chee".
Literally, great sword (great in terms of size). By itself, 刀 is read as katanaKATANA 刀 "sword" learn more.... 太 is used in everyday conversation as some variant of the word 太い (futoi, “fat”). The Chinese pronunciations are ta and tai. As ta, the kanji is a popular one to use in boys’ names, such as Yūta (勇太, literally “great in courage”). As tai, it is often used before certain other kanji to refer respectfully to one in a high position. For example, 太子 (taishi, literally “great child”) refers to the Crown Prince.