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

That month, the couple was spotted aboard a luxury yacht in Mallorca with Aniston's Horrible Bosses costar Jason Bateman, his wife Amanda Anka, and comedian Amy Schumer. —Ryan Coleman, Entertainment Weekly, 4 Nov. 2025

Based on photos of him with his costars (always hugging, sometimes kissing), the feeling appears to be very mutual. —Julie Jordan, PEOPLE, 4 Nov. 2025

Verb

The couple broke their engagement news to their Happy's Place costars through a video. —Ashlyn Robinette, PEOPLE, 4 Nov. 2025

O'Neill costars on All's Fair as the husband of Close's Dina. —Randall Colburn, Entertainment Weekly, 4 Nov. 2025

Word History

First Known Use

Noun

1888, in the meaning defined above

Verb

1896, in the meaning defined at sense 2