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English definition of “understudy”

understudy

noun [C]
 
 
/ˈʌndəˌstʌdi/
an actor in the theatre who learns the words and actions of another character so that they can perform if the usual actor is sickOccupations and tradesCasting, roles and scripts
(Definition of understudy from the Cambridge Learners Dictionary © Cambridge University Press)
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