backstage

adverb

1. behind the proscenium in a theater, especially in the wings or dressing rooms.
2. toward the rear of the stage; upstage.
3. out of view of the public; in private; behind the scenes: Many of the deals were made backstage at the convention.

adjective

4. located or occurring backstage.
5. of or relating to activities unknown to the public.
6. of or relating to the private lives of people in the entertainment industry: backstage gossip.

noun

7. Theater. a backstage area.

adverb

1. behind the part of the theatre in view of the audience; in the dressing rooms, wings, etc
2. towards the rear of the stage

adjective

3. situated backstage
4. informal away from public view

also back-stage, 1898, from back (adj.) + stage (n.).