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to bear a grudge against; to resent; to blame; to curse; to feel bitter towards
彼を恨む気持ちはもうなくなった。
I no longer feel resentment toward him.
人を恨むよりも自分を変えるべきだね。
Instead of resenting others, let's change ourselves.
彼女は裏切った友人を恨んでいた。
She resented the friend who betrayed her.