throw a wet blanket on

throw a wet blanket on (third-person singular simple present throws a wet blanket on, present participle throwing a wet blanket on, simple past threw a wet blanket on, past participle thrown a wet blanket on)

1. (figurative) To discredit; to spoil or disparage.
   • 2023 December 2, Susannah Savage, “Corn's sharp decline proves a bonanza for hedge funds”, in FT Weekend, Companies & Markets, page 15:

     “Supplies have risen dramatically as a result of that higher acreage but demand has stayed sluggish,” said Michael Magdovitz, senior commodity analyst at Rabobank. This had thrown a “wet blanket” on corn.