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A person who stars or acts in a production alongside another person.
Example Sentence: Julia Roberts and Richard Gere were famous costars in the movie "Pretty Woman".
To star or act in a production alongside another person.
Example Sentence: Brad Pitt will costar with Leonardo DiCaprio in Quentin Tarantino's upcoming film.
To feature or include (a person) as a costar in a production.
Example Sentence: The director decided to costar two talented actors in his new play.