What is the meaning of Upstage?

The part of a stage that is farthest from the audience or camera.

Toward or at the rear of a theatrical stage.

Away from the audience or camera.

At the rear of a stage.

Haughty, aloof.

To draw attention away from others, especially on-stage.

To force other actors to face away from the audience by staying upstage.

To treat snobbishly.

To restage upward; to restage (a case of a disease, usually a cancer) to a higher stage than that found at last assessment.

Source: wiktionary.org