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

Natasha Rothwell swanned into the auditorium as the lights were lowered, as her costar Dom Hetrakul literally carried her gown's train to limit the number of people stepping on it. —Anthony Robledo, USA Today, 16 Sep. 2025

Pascal, who starred in the Marvel movie of the summer as stretchable man Reed Richards, joins costars Vanessa Kirby, Joseph Quinn, and Ebon Moss-Bachrach in goofing off on set. —Nick Romano, Entertainment Weekly, 16 Sep. 2025

Verb

Reba and Rex reconnected on the set of Young Sheldon and then went on to costar in the Lifetime original movie The Hammer. —Christopher Rudolph, PEOPLE, 15 Sep. 2025

The Love Boat costars Ted Lange, Fred Grandy, and Jill Whelan collaborated on the Off Broadway play Lady Patriot. —Wesley Stenzel, Entertainment Weekly, 12 Sep. 2025

Word History

First Known Use

Noun

1888, in the meaning defined above

Verb

1896, in the meaning defined at sense 2