Have a heart! Definition 1 of 2Pro Tip 1/3Emotional Appeal Used when appealing to someone's better nature to be understanding or forgiving. Jake, have a heart! She was just late once. Pro Tip 2/3Urgent Request Said when asking for compassion urgently, often in a situation where someone is upset or in trouble. Please have a heart, she's really struggling. Pro Tip 3/3Emotional Context Often accompanies situations of distress or where there's a moral decision to be made. Have a heart and forgive him; we all make mistakes.