宿恨

両家の間には何代にもわたる宿恨があった。

There was a grudge between the two families going back generations.

彼はついに長年の宿恨を晴らした。

He finally settled his long-held grudge.

宿恨を捨てて手を結ぶべき時が来た。

The time has come to set aside old grudges and join hands.