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

Kelly's Love Story costar Grace Gummer shows a bit of skin in a fashionable leather set in New York City’s Hudson Square on April 29. —Escher Walcott, PEOPLE, 3 May 2026

But as the costars became teens, Knight and Plumb, who played fellow middle child Jan Brady, attempted to date. —Taijuan Moorman, USA Today, 1 May 2026

Verb

The Pitt costars Isa Briones and Patrick Ball take to the carpet at the 41st Annual Lucille Lortel Awards on May 3 in New York City. —Toria Sheffield, PEOPLE, 4 May 2026

Hundreds of exhibits, which were unsealed in January, included messages from Taylor Swift, Matt Damon and Ben Affleck, and costars Jenny Slate and Isabela Ferrer, among other figures. —Kimi Robinson, USA Today, 4 May 2026

Word History

First Known Use

Noun

1888, in the meaning defined above

Verb

1896, in the meaning defined at sense 2