I. ˈəp-ˈstāj adverb
Date: 1870
1. : toward or at the rear of a theatrical stage
2. : away from a motion-picture or television camera
II. adjective
Date: 1918
1.
[ upstage (III)]
: haughty
2. : of or relating to the rear of a stage
III. ˌəp-ˈstāj transitive verb
Date: 1921
1. : to draw attention away from
upstaging the competition
2. : to force (an actor) to face away from the audience by staying upstage
3. : to treat snobbishly
IV. ˈəp-ˌstāj noun
Date: circa 1931
: the part of a stage that is farthest from the audience or camera