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

This seemingly marks the first time Tom has publicly spoken about his engagement to his 29-year-old Marvel costar since the news broke in January that the longtime couple would be heading down the aisle. —Rachel McRady, PEOPLE, 30 Sep. 2025

Wednesday actresses Emma Myers and Evie Templeton reunited with their Season 2 costar Lady Gaga for the first of the singer’s eight Mayhem Ball shows at London’s O2 Arena and Manchester’s Co-Op Live Monday night. —Dessi Gomez, Deadline, 30 Sep. 2025

Verb

At the ceremony, Drescher was supported by her The Nanny costars Nicholle Tom, who played Margaret 'Maggie' Sheffield, and Madeline Zima, who played Gracie Sheffield. —Escher Walcott, PEOPLE, 1 Oct. 2025

He'll next be seen playing another real-life figure, Sam Bankman-Fried, on Netflix's The Altruists, which costars Julia Garner as Bankman-Fried's business partner Caroline Ellison. —Allison Degrushe, Entertainment Weekly, 30 Sep. 2025

Word History

First Known Use

Noun

1888, in the meaning defined above

Verb

1896, in the meaning defined at sense 2