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discord; (on) bad terms (with)
兄弟が不仲になり家族が心を痛めた。
The brothers fell out, causing the family grief.
不仲だった二人が再び手を取り合った。
The two who had been on bad terms joined hands again.
隣国との不仲が外交上の課題となっている。
The discord with the neighboring country has become a diplomatic issue.