From Longman Dictionary of Contemporary Englishgive/lose your heart to somebodygive/lose your heart to somebodyto start to love someone very much → heart
Examples from the Corpus
give/lose your heart to somebody• I had lost my heart to the little, golden flowers that brightened the meadows like a thousand suns.• This very thing was only one of the reasons why he had never wanted to lose his heart to anyone. 