rain on somebody's parade
rain on (one's) parade
To ruin one's plans or dampen one's excitement. I hate to rain on your parade, but I think your A in chemistry was actually a clerical error. Mom really rained on our parade by chaperoning our school dance.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
ˌrain on somebody’s ˈparade(American English) spoil something for somebody: Drugs again rained on the Olympics’ parade as another athlete tested positive for an illegal substance.
Farlex Partner Idioms Dictionary © Farlex 2017