be head over heels in lovebe head over heels (in love)
to be in love with someone very much, especially at the beginning of a relationship.
It's obvious that they're head over heels in love with each other.
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be head over heels (in love)
To be completely enamored of someone, typically a new romantic partner. Oh, I know he's head over heels in love with Christina—he won't stop gushing about her!We used to be head over heels, but now we just annoy each other most of the time.