Definitions

1. adverb

in a place or at a time where one is not visible or participating in an event, especially a theatrical performance

“The actress slipped offstage to change into her costume before the next scene.”

2. noun

a place or area in a theater or other performance venue where actors or performers wait to go on or go off stage

“The actors waited in the wings, ready to move offstage and exit the play.”

3. preposition

away from or outside the stage or area of a performance, especially a theatrical performance

“The musicians moved offstage to set up their equipment for the next performance.”