7 Essential Words of Fall
1918 (adj.), 1921 (v.); the notion is of drawing attention to oneself (and away from a fellow actor) by moving upstage -- to the rear of the stage -- so that the other actor must face away from the audience. The noun upstage "back of the stage" is recorded from 1870.
Haughty; aloof; snobbish: ''Upstage'' has taken on the additional meaning of ''ritzy,'' that is, arrogantly proud and vain (1918+)verb