大煞风景
A wet blanket.
A fly in the ointment.
Take all the fun out of.

eg：His cruel remarks puts a wet blanket on the party.

中英俚语俗语来源：李义山·杂篡：“其一曰煞风景，谓清泉灌足，花上晒裤，背山起楼，烧琴煮鹤，对花啜茶，松下喝道也”