pour cold water on

pour cold water on something 

1. Lit. to douse something with cold water. Pour cold water on the vegetables to freshen them. I poured cold water on my head to cool myself off.

2. and dash cold water on something; throw cold water on something Fig. to discourage doing something; to reduce enthusiasm for something. (Alludes to cooling passion with cold water.) When my father said I couldn't have the car, he poured cold water on my plans. John threw cold water on the whole project by refusing to participate.

See also: cold, pour, water

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pour/throw cold water on something   (informal)

if you pour cold water on opinions or ideas, you criticize them and stop people believing them or being excited about them Margaret Thatcher poured cold water on the idea of a European central bank.

See also: cold, pour, water