/ ˌʌpˈsteɪdʒ; NAmE / adverb , adjective , verb
■ adverb , adjective
at or towards the back of the stage in a theatre
OPP downstage
■ verb
[ vn ] to say or do sth that makes people notice you more than the person that they should be interested in :
She was furious at being upstaged by her younger sister.