The term "cooling out" typically implies a sense of relaxation or calming down. Antonyms for this term may include words such as excite, agitate, or provoke, which all suggest a state of heightened emotion or energy. Other antonyms could be words like intensify, escalate, or inflame, which suggest a sense of increasing intensity or tension. However, it's important to note that the context in which the term "cooling out" is used may influence the specific antonyms that are most appropriate. For example, in a medical context, antonyms like "heating up" or "warming up" might be more appropriate to describe the effects of certain treatments or therapies.