a person who does somebody’s job for a short time when they are not available 代行职务者 I acted as Tom’s stand-in when he was away. 汤姆不在时我替他顶班。 the stand-in captain 替补队长
a person who replaces an actor in some scenes in a film, especially dangerous ones （尤指影视中做危险动作的）替身演员 Most of the stunts are performed by stand-ins. 大部分特技由替身演员完成。