Select the most appropriate meaning of the given idiom.

Have a change of heart

Change one's opinion

The most appropriate meaning of the given idiom "have a change of heart" is (2) Change one's opinion.

The idiom "have a change of heart" means to change one's mind about something. It is often used to describe someone who has decided to do something different from what they had originally planned.

The other options do not fit the meaning of the idiom.

• Undergo a surgery is not the same as having a change of heart.
• Fall in love with someone is not the same as having a change of heart.
• Express happiness about something is not the same as having a change of heart.