a wet blanket
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Related to a wet blanket: same old same old, a white elephant, along the lines, worse for wear, To Say the Least
Someone who ruins other people's fun. Don't invite Nicole to the party. She's such a wet blanket that she'll probably just complain the whole time. David was tired of being called a wet blanket by his friends just because he doesn't drink alcohol.
a wet blanketINFORMAL
If you call someone a wet blanket, you mean that they stop other people from enjoying themselves by being boring or miserable. `Hey', said Thack, looking at Michael. `Stop being such a wet blanket.' I'm sorry if I've been a wet blanket today.