idioms

harden your heart (make yourself stop caring or not feel pity for someone) She tried to harden her heart and tell him to leave. Molly hardened her heart against him.     envocabulary.com

hand on heart (swear that something is true) Are you telling me, hand on heart, that you will never read my private messages? I can put my hand on my heart and say that I’ll never leave you.     envocabulary.com

cold hearted (cruel, uncaring, unfeeling) He was a cold-hearted killer. Don’t be so coldhearted; respect your elder brother.   envocabulary.com

come to mind (remember or think of) What would you like to eat? – I’m not sure; nothing comes to mind. When I was reading the book, a new idea for the plan came to mind.   envocabulary.com

change your mind (change your decision or opinion) I am not going, but if you are willing to go, I will change my mind. If you don’t buy the house now, she may change her mind and refuse to sell it.   envocabulary.com