Noun has 1 sense

• downstage(n = noun.artifact) - the front half of the stage (as seen from the audience);

Adjective has 1 sense

• downstage(a = adj.all) - of the front half of a stage;
Antonym: upstage

Adverbial has 1 sense

• downstage(r = adv.all) - at or toward the front of the stage; "the actors moved further and further downstage"

Antonym: upstage