Select the most appropriate meaning of the given idiom.

Falling head over heels

Falling deeply in love with someone

The most appropriate meaning of the idiom "falling head over heels" is falling deeply in love with someone.

The idiom "falling head over heels" is used to describe someone who is deeply and passionately in love with someone else. It is often used to describe someone who is completely swept off their feet by someone else.

For example, you might say "I fell head over heels in love with him the moment I saw him." or "She's head over heels in love with her new boyfriend."

The other options are not as appropriate. To feel deep sympathy to the needy means to feel compassion for people who are in need. To find fault with others means to criticize them or to point out their mistakes. And to fix models without proper analysis means to make changes to a model without first understanding why it is not working properly.