stand-in
🇺🇸
/ˈstænd ɪn/
🇬🇧
/ˈstænd ɪn/
A person who temporarily takes the place of someone else.
When the lead singer got sick, the backup singer was the stand-in for the concert.
A person who performs certain scenes for an actor, often for safety reasons.
The actor had a stand-in for the high fall scene in the movie.