informalSPOIL someone who seems to want to spoil other people’s fun, for example by refusing to join them in something enjoyable that they are doing 扫兴的人，泼冷水的人
Examples from the Corpus
wet blanket• Why be a wet blanket now?• Roy is just like something you'd find in a baby's pram-a wet blanket.• They thought he was a middle aged wet blanket.• But there was no large wet blanket to be had.• Morose Michell wins the wet blanket award.