noun
the four great Japanese grammar texts
Refers specifically to the works of Yamada Yoshio, Matsushita Daizaburō, Hashimoto Shinkichi, and Tokieda Motoki. A technical term in Japanese linguistics.
日本語学の授業で四大文法について学んだ。
I learned about the four great Japanese grammar texts in my Japanese linguistics class.
From 四 (four) + 大 (great) + 文法 (grammar). The term is a modern classification in Japanese linguistics.