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

1.
潑冷水, 掃興
to have a negative effect on something, making it less enjoyable or successful
:
•
The bad weather really put a damper on our picnic plans.
惡劣的天氣真的給我們的野餐計畫潑了冷水。
•
His negative attitude always puts a damper on team morale.
他的消極態度總是給團隊士氣潑冷水。