Going head over heels is an idiom that means to be completely and utterly in love with someone or something. It is often used to describe a person who is so in love that they are willing to do anything for the object of their affection. The crossword solution for this term is 'somersaulting, ' which is an acrobatic move where a person flips over backwards, usually while in the air. Somersaulting is a physical representation of the phrase going head over heels, as it implies a person is so in love that they are willing to take risks and flip over backwards.