Ways to Say Relax & Calm Down:
If someone is talking loudly, yelling, or screaming and you want them to speak in a lower tone of voice, you can say… Please, lower your voice. (Use this in a formal/professional setting.) Please, don’t talk so loudly. Please stop yelling/screaming. If you want the person to stop talking about the situation or physically stop taking action, you can say… Just, let it go. Just, drop it. Give it a rest. If you want the person to pause and think, you can say… Please stop and think. (Use this in a formal/professional setting.) Wait a moment. Hold your horses.