Lose your heart - Idioms by The Free Dictionary
lose your heart
lose your heart LITERARY
If you lose your heart to someone, you fall in love with them. Note: The heart is traditionally regarded as the centre of the emotions. She falls in love with Raul, who in turn has lost his heart to Silvia.
lose your ˈheart (to somebody/something) (formal) fall in love (with somebody/something): I’ve quite lost my heart to those little kittens of yours. Can we take one home?