idioms

back the wrong horse (support a person or action that is not successful) I don’t want to back the wrong horse, but I think Jimmy is a better candidate. When you back the wrong horse, you indeed support the losing side in something.   – English Vocabulary

have a soft spot in your heart for (feel that you like someone or something very much) Ethan has a soft spot in his heart for Emily. He has a soft spot in his heart for action movies.    – English Vocabulary  

have a heart (be kind, be reasonable) Don’t make me do it again! Have a heart! Have a heart, John, and lend me some money until tomorrow.     – English Vocabulary

halfhearted (without effort, interest, or enthusiasm) He made a halfhearted attempt to write his paper, which is why the teacher gave him a D. He took the garbage out for collection in a half-hearted way this time.     – English Vocabulary

hale and hearty (strong and healthy) Getting up early to exercise every day keeps me hale and hearty. My grandfather is 80 years old but still hale and hearty.     – English Vocabulary