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

Dan Levy, who co-created and starred on the award-winning series Schitt’s Creekalongside O'Hara, recently remembered his beloved costar in an emotional interview on The Tonight Show Starring Jimmy Fallon. —Mekishana Pierre, Entertainment Weekly, 7 Apr. 2026

Post-Euphoria, Ferreira has turned her attention largely to film, notably appearing opposite John Leguizamo in 2024’s Bob Trevino Likes It, and made her Broadway debut (with the support of some of her former Euphoria costars) in Cult of Love. —Bailey Richards, PEOPLE, 7 Apr. 2026

Verb

The Drama costars Robert Pattinson and Zendaya continue their press tour with an appearance on The Tonight Show Starring Jimmy Fallon in New York City on April 1. —Escher Walcott, PEOPLE, 4 Apr. 2026

Then, Cat Witch, whose identity has been known to viewers as Descendants costar Kylie Cantrall, finally revealed herself to the panel as well. —Jillian Sederholm, Entertainment Weekly, 2 Apr. 2026

Word History

First Known Use

Noun

1888, in the meaning defined above

Verb

1896, in the meaning defined at sense 2