生しょう涯がい最さい高こう

noun which may take the genitive case particle 'no'

best of one's life; lifetime best

Used as a no-adjective to describe a personal record or achievement that is the best in one's life so far. Often seen in sports, career, or personal milestones.

• 彼かれは生しょう涯がい最さい高こうの記き録ろくを更こう新しんした。

  He broke his lifetime best record.

• これは私わたしの生しょう涯がい最さい高こうの作さく品ひんです。

  This is the best work of my life.