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

Sources told the Hollywood Reporter that Anderson and her costar ultimately took home equal pay for the series. —Emma Burleigh, Fortune, 23 June 2025

The two would later appear as costars in Citizen Ruth (1996), Daddy and Them (2001), Inland Empire (2006) and on HBO's Enlightened. —Andrea Wurzburger, People.com, 22 June 2025

Verb

The actress costars in the film alongside Chris Evan and Pedro Pascal. —Julia Teti, Footwear News, 6 June 2025

Greer costars as his cautiously supportive ex-wife, Amber-Linn. —Stacy Lambe, People.com, 4 June 2025

Word History

First Known Use

Noun

1888, in the meaning defined above

Verb

1896, in the meaning defined at sense 2