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

While costar Martin Short has been nominated for lead actor in a comedy series every year since the cozy mystery comedy debuted in 2021, Martin and Gomez have only netted one nomination each over the show's long run. — Kelly Lawler, USA Today, 8 July 2026

The actor has nothing but incredible things to say about his costar and on screen fiancée. — Nicole Fell, HollywoodReporter, 8 July 2026

Verb

Garrett Clayton and Blake Knight Clayton received some help from his King Cobra costar Silverstone at his September 2021 wedding to his boyfriend of 10 years, Knight. — Grace Gavilanes, PEOPLE, 4 July 2026

Jodie Sweetin shared new insight into her current relationship with former Full House costars Mary-Kate and Ashley Olsen. — Mekishana Pierre, Entertainment Weekly, 2 July 2026

Word History

First Known Use

Noun

1888, in the meaning defined above

Verb

1896, in the meaning defined at sense 2