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

Fans suspected something was off when star and producer Blake Lively and costar-director Justin Baldoni abstained from doing joint press — or even being photographed together — during the film's promotional tour. — Declan Gallagher, Entertainment Weekly, 15 July 2026

Meanwhile, Ora also opened up about working with costar Kylie Cantrall, who plays the Queen of Hearts’ daughter Red. — Gabrielle Rockson, PEOPLE, 15 July 2026

Verb

On the red carpet of The Odyssey, Tom Holland was asked to compare his Spider-Man to costar Robert Pattinson’s Batman. — Tiffany Kelly, Entertainment Weekly, 15 July 2026

Mia Goth, Charlize Theron, Robert Pattinson, John Leguizamo, Zendaya, Bernthal, Mia Goth, Benny Safdie, Himesh Patel and Samantha Morton all costar in the movie, among others. — Tommy McArdle, PEOPLE, 13 July 2026

Word History

First Known Use

Noun

1888, in the meaning defined above

Verb

1896, in the meaning defined at sense 2