costar: Meaning and Definition of

co•star

1. a performer, esp. an actor or actress, who shares star billing with another.
2. a performer whose status is slightly below that of a star.

1. to share star billing with another performer.
2. to receive billing of slightly less status than that of a star.

1. to present (two or more actors) as having equal billing or prominence.
2. to present as having slightly less status than that of a star.