throw cold water on vs pour cold water on

throw cold water on and pour cold water on both are verbs.

Word	Noun	Adjective	Verb	Adverb
throw cold water on	No	No	Yes	No
pour cold water on	No	No	Yes	No

As verbs, throw cold water on and pour cold water on are synonyms defined as:

throw cold water on and pour cold water on: be discouraging or negative about

throw cold water on (verb)	pour cold water on (verb)
be discouraging or negative about	be discouraging or negative about