understudy
🇺🇸
/ˈʌndərstʌdi/
🇬🇧
/ˈʌndəstʌdi/
A person who is trained to take over the role of another person in a performance, in case the original person is unable to perform.
She was the understudy for the lead role in the play.
To be trained to take over the role of another person in a performance, in case the original person is unable to perform.
He has been understudying the lead role for the past three months.