The rear part of the stage

Upstage is a 1926 American silent romantic drama film directed by Monta Bell, starring Norma Shearer and New York musical comedy star Oscar Shaw.

Upstage was a free monthly publication founded by Gary Wien that covered arts and entertainment in New Jersey, US.

UpStage is an open source server-side application that has been purpose built for Cyberformance: multiple artists collaborate in real time via the UpStage platform to create and present live theatrical performances, for audiences who can be online or in a shared space, and who can interact with the performance via a text chat tool.

Treat snobbishly, put in one's place

Move upstage, forcing the other actors to turn away from the audience

Steal the show, draw attention to oneself away from someone else

Of the back half of a stage

Remote in manner

At or toward the rear of the stage