stand-in

stand-in
ˈstand-in noun [countable]
1. someone who does the job or takes the place of someone else for a short time:
    Gilbert failed to find a stand-in and so could not go to the party.
2. someone who takes the place of an actor for some scenes in a film
    stand-in for
    a stand-in for Tom Cruise
⇨ stand in at stand¹

stand-inBrE /ˈstænd ɪn/ 🔊NAmE /ˈstænd ɪn/ 🔊 nouna person who does sb's job for a short time when they are not available 代行职务者a person who replaces an actor in some scenes in a film/movie, especially dangerous ones （尤指影视中做危险动作的）替身演员