Upstage

wiktionary

ref

up- +‎  stage. The figurative uses “haughty” and “to draw attention away” derive from actors moving to a higher and thus more visible position on a sloped stage. [1]

etymonline

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upstage (adv.)

1855 in theatrical jargon, "to the rear of the stage," from up (adv.) + stage (n.). From 1901 as an adjective, 1916 as a noun. The notion in the verb (1921) is of drawing attention to oneself (and away from a fellow actor) by moving upstage, so that the other actor must face away from the audience. Related: Upstaged; upstaging.