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

But while Hannah herself, Miley Cyrus, was game to sing songs and answer questions alongside her father, Billy Ray Cyrus—who also played her dad on the show—viewers couldn’t help but notice the lack of costars. —Elizabeth Logan, Glamour, 24 Mar. 2026

Original costar Rosa Salazar then dropped out of the series, with Fumero stepping into her role. —Joe Otterson, Variety, 24 Mar. 2026

Verb

Super Mario costars Chris Pratt and Jack Black stop by the paddock during the F1 Grand Prix in Suzuka, Japan, on March 29. —Toria Sheffield, PEOPLE, 31 Mar. 2026

Connections were made in the Dolby lobby bar where Bugonia costars Emma Stone and Alicia Silverstone reunited. —Shania Russell, Entertainment Weekly, 16 Mar. 2026

Word History

First Known Use

Noun

1888, in the meaning defined above

Verb

1896, in the meaning defined at sense 2