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English definition of “understudy”

understudy

noun [C] uk   /ˈʌn.dəˌstʌd.i/ us    /-dɚ-/
an actor who learns the parts of other actors in a play, so that he or she can replace them if necessary, for example if they are illCasting, roles and scriptsActors and performers
understudy
verb [T] uk   us  
(Definition of understudy from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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