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

Superstore alums took to social media to memorialize their former costar on Thursday. —Lauren Huff Published, EW.com, 8 Aug. 2025

However, his new costar Eddie Murphy had an interesting approach to sharing his wisdom. —Michael Nied, People.com, 7 Aug. 2025

Verb

Séamus McLean Ross costars on Blood of My Blood as a young Colum MacKenzie, the sickly brother of Ellen and Dougal, who goes on to become laird of the clan. —EW.com, 8 Aug. 2025

When does The Thomas Crown Affair come out? Aside from the crime caper remake, Jordan is also slated to costar with Will Smith in I Am Legend 2, the sequel to the 2007 post-apocalyptic thriller. —Christopher Rudolph, People.com, 6 Aug. 2025

Word History

First Known Use

Noun

1888, in the meaning defined above

Verb

1896, in the meaning defined at sense 2