泼冷水 (pōlěnɡshuǐ) Pour cold water on / Dampen the enthusiasm of
The character “泼 (pō)” means to pour or to throw; “冷 (lěng)” means cold
and “水 (shuǐ)” means water.
Example:
Tā běnlái jiù xìnxīn bù zú, nǐ jiù bié gěi tā pōlěngshuǐ le.
他本来就信心不足，你就别给他泼冷水了。
You should not pour cold water on him, for he is not confident.
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