両家の間には今なお旧恨がくすぶっている。
An old grudge still smolders between the two families.
彼は旧恨を忘れて、かつての敵と手を結んだ。
He set aside his old grudge and joined hands with his former enemy.
その事件は両国の旧恨を再び呼び覚ました。
The incident reawakened the long-standing enmity between the two countries.