rain on someone's parade

verb2

•
To spoil someone's celebration.
- Sanju Baba, we learn, is rather miffed at the way Kunder rained on his parade and took away the spotlight from Agneepath's success. — 2012
•
(figurative) To disappoint or discourage someone by ruining or criticizing their plans or aspirations.
- I hate to rain on your parade, but lots of people have tried that strategy and it hasn't worked yet.

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