‘泼冷水’ literally means ‘to pour cold water’—a vivid metaphor for dampening someone’s excitement, confidence, or enthusiasm. The verb 泼 (pō) means ‘to splash’ or ‘to pour,’ 冷 (lěng) means ‘cold,’ and 水 (shuǐ) means ‘water.’ Together, they evoke the physical shock of cold water suddenly poured on a person, symbolizing an abrupt, often blunt, discouragement. It’s commonly used when someone responds skeptically, critically, or pessimistically to another’s optimistic plan, bold idea, or passionate proposal.

This expression is informal but widely understood across age groups and contexts—from casual conversations among friends to workplace feedback or media commentary. While not inherently rude, its tone depends heavily on delivery and relationship; saying it gently may signal concern, whereas saying it harshly can feel dismissive or demoralizing. It’s rarely used in formal writing, and never with literal cold water—it’s always figurative.