The antonyms for the word "fires up" can include expressions such as "calms down," "cools off," or "eases up." These terms indicate a reduction or decrease in the intensity or excitement level. When someone calms down, they become more relaxed and composed, while someone who cools off becomes less passionate or enthusiastic. Similarly, easing up can suggest a release of tension, bringing a sense of relief or relaxation. Antonyms for "fires up" can be useful in situations where maintaining a calm or moderate mood is essential, such as during negotiations or conflict resolution, or when dealing with emotionally challenging situations.