cast a shadow over (something)

cast a shadow over (something)

To dampen, spoil, or ruin something that was hitherto good or positive. The boy's broken finger cast a shadow over his birthday party. This scandal will undoubtedly cast a shadow over her otherwise impeccable career.
See also: cast, over, shadow
Farlex Dictionary of Idioms.
See also:
  • piss on (one's) party
  • queer somebody's pitch
  • queer someone's pitch
  • queer the/(one's) pitch
  • louse (something) up, to
  • louse something up
  • louse up
  • crap up
  • goof-proof