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

Rose was surrounded by friends and colleagues from the Oppenheim Group, including costars Harper, 32, Kayla Cardona and fellow agents Sandra Shany and Serena Jin. —Gabrielle Rockson, PEOPLE, 23 Sep. 2025

Williams was a part of a group of several costars, including Katie Holmes and Joshua Jackson, who participated in the event. —Lisa Respers France, CNN Money, 23 Sep. 2025

Verb

He was photographed alongside his fiancée and Spider-Man costar Zendaya at the event, which was held at Christie’s auction house in London. —Jodi Guglielmi, Rolling Stone, 21 Sep. 2025

Russell Crowe, Dave Bautista, Marisa Abela, Karen Gillan, Djimon Hounsou, and Max Zhang will costar alongside Cavill. —Raechal Shewfelt, Entertainment Weekly, 19 Sep. 2025

Word History

First Known Use

Noun

1888, in the meaning defined above

Verb

1896, in the meaning defined at sense 2