The phrase "turned heat" refers to increasing the temperature of something or someone. Antonyms for this phrase would involve lowering the temperature or cooling down. Some possible antonyms could include "cooled off," "chilled out," "reduced heat," or "tempered." These words all suggest a decrease in intensity or agitation. They can be applied to both physical and emotional situations, indicating a state of calmness, relaxation, or lack of tension. For example, when someone is angry and worked up, they may need to cool off or chill out before they can have a productive conversation. Similarly, when cooking, there are times when you need to reduce the heat to avoid burning or overcooking your food.