any featured actor or actress given equal prominence with another or others in a film, play, etc.
Origin of costarco- + star
intransitive verb-·starred′, -·star′ring
to present as or be a costar
A starring actor or actress given equal status with another or others in a play, film, or television series.
tr. & intr.v.co·starred, co·star·ring, co·stars
To act or present as a costar.
- (acting) A person who shares star billing.
- The once famous actor objected to his costar having a bigger dressing room.
- (acting) A person who slightly lacks the status to be considered a star.
- Alas, always a costar but never a star.
(third-person singular simple present costars, present participle costarring, simple past and past participle costarred)
- to perform with the billing of a costar.
- People thought his career was over but now he will get to costar on Broadway next month.
co- + star