What is the meaning of Downstage?

Toward or at the front of a theatrical stage.

Towards a motion-picture or television camera.

At the front of a stage.

The part of a stage that is closest to the audience or camera.

To restage downward; to restage (a case of a disease, usually a cancer) to a lower stage than that found at last assessment (compare upstage).

Source: wiktionary.org