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Phrase(s): fall head over heels in love (with someone)
Fig. to fall deeply in love with someone, especially suddenly. • Roger fell head over heels in love with Maggie, and they were married within the month. • Very few people actually fall head over heels in love with each other. • She fell head over heels in love and thought she was dreaming.
McGrawhill's American Idioms And Phrasal Verbs