on or onto the stage (opposed to offstage): The director shouted, “Onstage, everybody!”
adjective
of, relating to, or used in the acting area, or that part of the stage that is in view of the audience.
Origin of onstage
First recorded in 1925–30; on + stage
Words nearby onstage
on someone's coattails, on someone's nerves, on someone's side, on speaking terms, on spec, onstage, on standby, on-stream, on strike, on sufferance, ont-