Bring down the curtain on something
Definition 1 of 2
Pro Tip 1/3Figurative Usage
Often used metaphorically to indicate the end of a process or activity. 
He decided to bring down the curtain on his days as an amateur athlete.
Pro Tip 2/3Finality
It conveys a sense of final closure, with no continuation expected. 
They plan to bring down the curtain on the project after the presentation.
Pro Tip 3/3Not Always Literal
It doesn't necessarily involve a physical curtain or ending an entertainment event. 
With the merger, they will bring down the curtain on the old company name.