Synonyms of 'understudy'
He was an understudy to Charlie Chaplin on a tour of the USA.
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Someone who takes someone else's place in an organization, government, or team can be referred to as their replacement.
a replacement for the injured player
In this sport, you always have to have reserves.
Thesaurus for understudy from the Collins English Thesaurus
An actor's or actress's understudy is the person who has learned their part in a play and can act the part if the actor or actress is ill .