bring down the curtain (on something)
1. To bring a performance or act of a play to an end by lowering the theater curtain. The audience gave a standing ovation as they brought down the curtain. The theater company will bring down the curtain on their award-winning play for the last time this Friday.
2. To bring about or signal the end of something. Following the announcement, the company will bring down the curtain on over 50 years of business.