put a damper on

US /pʊt ə ˈdæmpər ɑn/
UK /pʊt ə ˈdæmpər ɑn/
"put a damper on" picture
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.
他的消極態度總是團隊士氣潑冷水