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

Ludacris, Walker's costar in the Fast franchise, seemed particularly uncomfortable with the jokes. —Brianna Zigler, Entertainment Weekly, 23 May 2026

Milo Ventimiglia Panettiere dated her Heroes costar, Milo Ventimiglia, from 2007 to 2009. —Christopher Rudolph, PEOPLE, 23 May 2026

Verb

Scrubs costars Donald Faison and Sarah Chalke are out and about in New York City on May 13. —People Staff, PEOPLE, 17 May 2026

Morena Baccarin costars as The Sorceress, with Alison Brie as Evil-Lyn, Kristen Wiig as the voice of Roboto, Idris Elba as Man-At-Arms, Camila Mendes as Teela, and Jared Leto — who seems to appear in every reboot of every franchise — as Skeletor. —Jami Ganz, New York Daily News, 16 May 2026

Word History

First Known Use

Noun

1888, in the meaning defined above

Verb

1896, in the meaning defined at sense 2