understudy Meaning, Definition & Usage
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noun an actor able to replace a regular performer when required
standby.
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verb be an understudy or alternate for a role
alternate.
WordNet
Un"der*stud`y transitive verb & intransitive verb
Definitions
(Theater) To study, as another actor's part, in order to be his substitute in an emergency; to study another actor's part.
Un"der*stud`y noun
Definitions
One who studies another's part with a view to assuming it in an emergency.