HSK 7-9
泼冷水
pō lěngshuǐto pour cold water on; (fig.) to dampen sb's enthusiasm
别急着给他的想法泼冷水。
Bié jízhe gěi tā de xiǎngfǎ pōlěngshuǐ.
Do not be too quick to discourage his idea.
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Appears across levels (7-9) in the HSK 3.0 word list.