1. actors who have equally important roles in a movie, play, or television show
Usage: plural of costar

1. to appear as a costar with another actor in a movie, play, or television show
Usage: third person singular present

Examples

• The two costars had great chemistry on screen.
• She costars with him in the new romantic comedy.
• The movie features several well-known costars.
• He costars alongside a famous actress in his latest film.
• The costars attended the premiere together.
• She costars in three different movies this year.
• The director chose costars who could work well together.