costar

1 of 2

noun

co·​star ˈkō-ˌstär 

variants or co-star

plural costars or co-stars

: one of two or more main performers who star in a movie, play, etc.

… the star seems more relaxed and confident, and there's a bracing snap to the byplay between him and his costars.

—Mark Harris

costar

2 of 2

verb

variants or co-star

costarred or co-starred; costarring or co-starring

1

transitive : to employ or present (someone) as one of two or more leading performers in a movie, play, etc.

Directed by Lasse Hallström … and costarring a fine ensemble …

—Leonora Langley

2

intransitive : to appear with another star in a movie, play, etc.

Examples of costar in a Sentence

Recent Examples on the Web

Noun

Rebel Wilson was cleared in a defamation case brought by The Deb costar Charlotte MacInnes. — Leigh Blickley, Entertainment Weekly, 22 July 2026

The actress stopped by the show to promote The Odyssey alongside costar Matt Damon and director Christopher Nolan. — Rachel Burchfield, InStyle, 21 July 2026

Verb

Misty Green costars Adam Driver as another apparent love interest of Misty’s, as well as Daniel Kaluuya as her troubled brother. — Jack Smart, PEOPLE, 22 July 2026

On the red carpet of The Odyssey, Tom Holland was asked to compare his Spider-Man to costar Robert Pattinson’s Batman. — Tiffany Kelly, Entertainment Weekly, 15 July 2026

Word History

First Known Use

Noun

1888, in the meaning defined above

Verb

1896, in the meaning defined at sense 2