back·stage 
(băkstāj)
(băkstāj)adv.
1. In or toward the area behind a performance space, especially the area in a theater comprising the dressing rooms.
2. In secret; privately.
adj. (băkstāj′)
1. Of, relating to, occurring in, or situated behind a performance space: backstage passes at a concert.
2. Concealed from the public; private.