To spoil the good mood around something.
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To spoil the good mood or excitement around something.
Putting a damper on it doesn't ruin the event completely — it just takes the joy out of it.
The cause can be news, weather, or one badly timed remark.
"Rain on Someone's Parade"
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Deliberately spoil someone's happy moment
"Take the Wind Out of Your Sails"
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Remove someone's confidence or drive
"Put a Damper on Something"
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Flatten the mood around something