Rain On One's Parade Meaning

Example : 2012 Jan 31, “Shah Rukh Khan, Shirish Kunder's drama ends”, Times of India, Bollywood:  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 February 22, “European Stocks Fall on Worse-Than-Expected PMI Data; TUI Drops”, Bloomberg Business Week:  â€œGiven that Europe is still shrouded by the cloud of recession, a weak PMI -- though not rain on the parade -- will surely damp investor sentiment,” said Manish Singh, the London-based head of investment at Crossbridge Capital