dampener
noun /ˈdæmpnə(r)/
/ˈdæmpnər/
(British English) (also damper British and North American English)
(informal)- dampener (on something) a thing that makes something less pleasant, successful, etc.
- Lily isn't letting motherhood put a dampener on her social life.
- The only dampener on the show was the rain at the closing ceremony.