遺い恨こん十じゅう年ねん

noun, adverb

grudge of ten years' standing; harboring a grudge for many years

A set phrase describing a deep, long-lasting resentment. Often used adverbially with に or as a noun. The 'ten years' is not always literal; it emphasizes the enduring nature of the grudge.

• 彼かれは遺い恨こん十じゅう年ねんの思おもいを込こめて復ふく讐しゅうを誓ちかった。

  He swore revenge with a grudge that had lasted ten years.

• 遺い恨こん十じゅう年ねん、ついにその時ときが来きた。

  After harboring a grudge for ten years, the time finally came.