Source : WordNet®

backstage
     adj : concealed from the public
     n : a stage area out of sight of the audience [syn: {wing}, {offstage}]
     adv 1: out of view of the public; behind the scenes; "Working
            backstage to gain political support for his proposal";
            "many private deals were made backstage at the
            convention"
     2: in or to a backstage area of a theater; "costumes were
        changed backstage"