noun
a person's shift in attitude or opinion
preposition
indicates the relationship between 'change' and 'heart'
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After much deliberation, she had a change of heart and decided to support the new policy.
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I was against going to the party at first, but I had a change of heart and ended up having a great time.
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I used to hate sushi, but I had a change of heart and now it's my favorite food.
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He was known for his stubbornness, but he had a change of heart and started to see things differently.