put a damper on

US /pʊt ə ˈdæmpər ɑn/
UK /pʊt ə ˈdæmpər ɑn/
"put a damper on" picture
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.
他的消极态度总是团队士气泼冷水