put a damper on
US /pʊt ə ˈdæmpər ɑn/
UK /pʊt ə ˈdæmpər ɑn/

1.
泼冷水, 扫兴
to have a negative effect on something, making it less enjoyable or successful
:
•
The bad weather really put a damper on our picnic plans.
恶劣的天气真的给我们的野餐计划泼了冷水。
•
His negative attitude always puts a damper on team morale.
他的消极态度总是给团队士气泼冷水。