off·stage 
(ôfstāj, ŏf-)
(ôfstāj, ŏf-)adj.
1. Situated or taking place in the area of a stage that is invisible to the audience.
2. Of, relating to, or taking place in private life: an offstage persona.
adv.
1. Away from the area of a stage visible to the audience.
2.
a. In private life: an actor known offstage by another name.
b. Behind the scenes; not visible to the public: The meetings between the leaders took place offstage.