Jumped down throat is a phrase commonly used to describe someone who reacts in an aggressive and confrontational manner. In this context, antonyms for this phrase would include calm, composed, and level-headed. A person who is calm and composed is unlikely to jump down someone's throat, and is more likely to react to a situation in a rational and thoughtful way. Other antonyms might include patient, understanding, and empathetic, as these qualities help to diffuse tensions and conflict in a given situation. By focusing on these antonyms, we can learn to navigate difficult situations with greater ease and understanding, and avoid unnecessary arguments and confrontations.