Английский разговорный словарь (основной) - understudy
Understudy
understudy
ˈʌndəˌstʌdɪ n. & v. esp. Theatr. --n. (pl. -ies) a personwho studies another's role or duties in order to act at shortnotice in theabsence of the other. --v.tr. (-ies, -ied) 1 study (a role etc.) as an understudy. 2 act as an understudy to (a person).