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To study or know (a role) so as to be able to replace the regular performer when required.
(verb-transitive)
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To act as an understudy to.
(verb-transitive)
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To be engaged in studying a role so as to be able to replace the regular performer when required.
(verb-intransitive)
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A performer who understudies.
(noun)
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A person trained to do the work of another.
(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.