stand-in
noun /ˈstænd ɪn/
/ˈstænd ɪn/
- a person who does somebody’s job for a short time when they are not available
- I acted as Tom’s stand-in when he was away.
- the stand-in captain
- a person who replaces an actor in some scenes in a film, especially dangerous ones
- Most of the stunts are performed by stand-ins.