also off-stage
1.
When an actor or entertainer goes ~, they go into the area behind or to the side of the stage, so that the audience no longer sees them.
She ran ~ in tears...
There was a lot of noise ~.
? onstage
ADV: ADV after v, n ADV
2.
Offstage is used to describe the behaviour of actors or entertainers in real life, when they are not performing.
...the tragedies of their off-stage lives.
? onstage
ADJ: ADJ n
•
Offstage is also an adverb.
Despite their bitter screen rivalry, off-stage they are close friends.
? onstage
ADV: ADV with cl