:to say that you do not like (an idea, suggestion, etc.) in a way that stops other people from doing it or from feeling enthusiastic about it给(想法、建议等)泼冷水;打消…的念头
He wanted to buy a new car, but I poured/threw cold water on that idea. [=I said he should not buy a new car]他想买辆新车,但我给他的这个念头泼了冷水。