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ameliorate (v) To make or become better; improve.
（状況・質などが）よくなる

You may easily imagine that I was much gratified by the offered communication, yet I could not endure that he should renew his grief by a recital of his misfortunes. I felt the greatest eagerness to hear the promised narrative, partly from curiosity and partly from a strong desire to ameliorate his fate if it were in my power. I expressed these feelings in my answer.
(Frankenstein -- by Mary Shelley)