rain on somone'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.
rain on somone's paradeprevent someone from enjoying an occasion or event; spoil someone's plans. informal, chiefly North American
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