One who upstages.

plural of upstager

(theater) 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. / (figuratively, obsolete) Haughty, aloof.

(figuratively, transitive) To draw attention away from others, especially on-stage. / (transitive, theater) To force other actors to face away from the audience by staying upstage.

Third-person singular simple present indicative form of upstage

present participle of upstage

(theater, also figuratively) A stealing of the spotlight, as (or as if) one performer eclipses another in the audience's attention.

simple past tense and past participle of upstage