Select the most appropriate meaning of the underlined idiom in the following sentence.
I really don't want to pour cold water on your theory but it cannot be applied to real life situations.
1
To destroy someone's written piece of work
2
To take revenge on someone by destroying their lives' work under the pretext of bad quality
3
To be critical or doubtful of a plan that someone is excited about
4
To give goosebumps by showing a prospect