rain on someone's parade
US /reɪn ɑn ˈsʌm.wʌnz pəˈreɪd/
UK /reɪn ɑn ˈsʌm.wʌnz pəˈreɪd/
1.
to spoil someone's pleasure or plans
:
•
I don't want to rain on your parade, but I think you should reconsider your decision.
•
He always manages to rain on someone's parade with his negative comments.