offstage

Short definition from Wiktionary

Adjective

1. 1
   Of or relating to that part of a stage not visible to the audience.
2. 2
   Of or relating to the private life of a celebrity.

Adverb

1. 1
   Taking place offstage (as above).

Verb

1. 1
   To relegate (part of a play) to the offstage area, rather than showing it to the audience.