蘊奥うんのうを極きわめる

expression, ichidan verb

master the secrets of; fathom the depths of

Obsolete literary expression meaning to thoroughly master the deepest, most esoteric aspects of an art, discipline, or teaching. In modern Japanese, one would more commonly use 奥義を極める or 秘伝を究める.

• 彼かれは長なが年ねんの修しゅ行ぎょうの末すえ、ついに剣けん術じゅつの蘊奥うんのうを極きわめたと伝つたえられる。

  It is said that after many years of training, he finally mastered the deepest secrets of swordsmanship.