throw a wet blanket on (something)

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throw a wet blanket on (something)

To make something be or seem less enjoyable, successful, or important. The court's decision throws a wet blanket on the president's plans for healthcare reform. Her crappy attitude really threw a wet blanket on the party. I could tell that Sean's football victory threw a wet blanket on Sam's news about getting into the college she wanted.
See also: blanket, on, throw, wet
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.