秘ひ術じゅつ

noun

secret art; secret technique; mysteries of an art

Refers to a closely guarded skill, method, or esoteric knowledge, often in traditional arts, crafts, or martial disciplines.

• その流りゅう派はの秘ひ術じゅつは門もん外がい不ふ出しゅつとされている。

  The secret techniques of that school are said to never be revealed to outsiders.

• 彼かれは師しから秘ひ術じゅつを伝でん授じゅされた。

  He was initiated into the secret art by his master.