raise the curtain on

noun

1. a piece of cloth or other material, sometimes arranged so that it can be drawn up or sideways, hung for decoration, as at a window, or to cover, conceal, or shut off something
2. anything that covers, conceals, separates, or shuts off: a curtain of fog
3. that part of a wall between two bastions, gates, etc.
4. Archit. an enclosing wall that does not support a roof
5. Theater
   1. the large drape or hanging screen at the front of the stage, which is drawn up or aside to reveal the stage
   2. the opening of the curtain at the beginning, or its closing at the end, of a play, act, or scene
   3. an effect, line, or situation in a play just before the curtain closes
   4. curtain call
6. ☆ Slang death; the end

transitive verb

1. to provide or decorate with a curtain
2. to cover, conceal, or shut off as with a curtain