rain on one's parade

rain on (one's) parade

To ruin one's plans or temper 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.
See also: on, parade, rain

rain on one's parade

Spoil one's plans, as in The minority party in the legislature has tried hard to rain on the speaker's parade, but so far his agenda has prevailed . This expression conjures up the image of a downpour ruining a celebration such as a parade. [c. 1900]
See also: on, parade, rain