understudy

 
Pronunciation: /ˈʌndəstʌdi/

noun (plural understudies)

  • (in the theatre) a person who learns another’s role in order to be able to act at short notice in their absence: he has played as understudy to Celtic’s usual goalkeeper he is understood to be understudy for the governor

verb (understudies, understudying, understudied)

[with object]
  • study (a role or actor) as an understudy: he had to understudy Prospero