冷却 (lěng què) literally combines 冷 (‘cold’) and 却 (a classical particle suggesting reversal or withdrawal), together conveying the idea of ‘cooling down’—both physically and emotionally. As a verb, it most commonly describes the process of reducing temperature, such as when machinery or food loses heat. It’s also widely used metaphorically to describe a decline in emotional intensity: enthusiasm, passion, interest, or excitement fading over time.

This dual meaning makes 冷却 versatile but context-dependent. In technical writing or engineering contexts, it refers strictly to thermal dissipation (e.g., cooling a reactor). In everyday speech or media, however, it frequently appears in discussions about relationships, public opinion, or market trends—e.g., ‘enthusiasm for the policy has cooled’. The word carries a neutral-to-slightly-negative connotation, implying a natural or inevitable loss of heat or fervor, not abrupt cancellation.