English is not my native language so I definitely don't want and intend to argue, but I had to check this because I have used "dampen" in that context many times over many years.... which doesn't make it any more correct, of course, and could mean that I made the same mistake many times over many years. So I went to the all knowing internet, and it told me this (so it must be true):
to check or diminish the activity or vigor of
: deaden
to become deadened or depressed
dampen someone's enthusiasm
https://www.merriam-webster.com/dictionary/dampen
https://dictionary.cambridge.org/us/...english/dampen