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

Not Suitable for Work costars Will Angus, Avantika Vandanapu, Ella Hunt, Nicholas Duvernay and Jack Martin are a stylish bunch in Hudson Square on May 27 in New York City. —People Staff, PEOPLE, 31 May 2026

On the latest episode of Netflix's The Pete Davidson Show, the host interviewed Nikki Glaser and brought up her costar in the upcoming ensemble comedy flick The Fifth Wheel. —Kathleen Perricone, Entertainment Weekly, 30 May 2026

Verb

Directed by Eric Appel, The Breadwinner costars Colin Jost, Zach Cherry, Martin Herlihy, Kumail Nanjiani and Will Forte. —Jack Smart, PEOPLE, 28 May 2026

Word History

First Known Use

Noun

1888, in the meaning defined above

Verb

1896, in the meaning defined at sense 2