understudy
verb (used with object)
to learn (a role) in order to replace the regular actor or actress when necessary.
Used to describe an action that began in the past, has continued continuously, and is still in progress.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The clear loser in all this is Roger Mudd, 52, who has been understudying Cronkite for the anchor role for almost a decade.
From Time Magazine Archive
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