throw a wet blanket over (something)

throw a wet blanket over (something)

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

throw a wet blanket over something

AMERICAN
If something throws a wet blanket over an event or situation, it makes it less successful or enjoyable. Cool, rainy weather has thrown a wet blanket over Michigan's tourism season.
See also: blanket, over, something, throw, wet
Collins COBUILD Idioms Dictionary, 3rd ed.
See also:
  • throw a wet blanket over something
  • put the dampener on (something)
  • put the damper on (something)
  • dampener
  • damper
  • put a dampener on (something)
  • put a damper on
  • put a damper on (something)
  • put a damper on something
  • the chance, etc. of a lifetime