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costar

American  
[koh-stahr, koh-stahr] / ˈkoʊˌstɑr, ˈkoʊˈstɑr /
Or co-star

noun

  • costars
    plural
  1. a performer, especially an actor or actress, who shares star billing with another.

  2. a performer whose status is slightly below that of a star.


verb (used without object)

costarred, costarring
  1. to share star billing with another performer.

  2. to receive billing of slightly less status than that of a star.

verb (used with object)

costarred, costarring
  1. to present (two or more actors) as having equal billing or prominence.

  2. to present as having slightly less status than that of a star.

Other Word Forms

Noun Inflected Forms


Etymology

Origin of costar

An Americanism dating back to 1915–20; co- + star


Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

The big joke of “Gail Daughtry” could be that Slattery joins the gang to help locate his old costar, with whom he’s lost touch after being left on read too many times.

From Salon ● Jul. 12, 2026

Actress Blake Lively has reportedly told a New York court that she lost more than $40 million as a result of “reputational damage” she suffered during her ongoing feud with her former costar, Justin Baldoni.

From MarketWatch ● Apr. 30, 2026

Instead, she at first finds Mr. Hamm’s “Mad Men” costar, a touchy John Slattery, living out of his garage.

From The Wall Street Journal ● Jan. 29, 2026

For while other actors were as photogenic on screen as Dean, including “Giant” costar Elizabeth Taylor, it’s difficult to think of another star who made such an impact with his still images.

From Los Angeles Times ● Sep. 30, 2025

"I don't really want to be the costar of anyone's life," I say.

From "Will Grayson, Will Grayson" by John Green and David Levithan

Later, in a pre-recorded skit, Hargitay and her costars from Law & Order SVU tried to solve the mystery of whether Taylor Swift would appear at the Emmys.

From BBC ● Sep. 15, 2026

The Oscar-nominated costars of “The Lost Daughter” have a new project together, “Wicked Little Letters,” as well as a giddy way of making each other laugh.

From Los Angeles Times ● Mar. 30, 2024

Callum, can you talk about starring in the film, and building a relationship with your costars as you training and prepared for the role?

From Salon ● Dec. 25, 2023

Curtis shared photos of herself and costars Wilson and Stanfield and a video to her Instagram that showed her leaning over the balcony to address a crowd of fans gathered below.

From Los Angeles Times ● Jun. 27, 2023

Howie answered phone calls from costars, his little cousin whose popularity in school is tied to Howie’s success, more lawyers, and his parents.

From "They Both Die at the End" by Adam Silvera

Nicky Katt, a character actor who costarred in Richard Linklater’s indie classic “Dazed and Confused” and the Fox series “Boston Public,” has died.

From Los Angeles Times ● Apr. 13, 2025

It was filmed entirely in Japan and costarred the legendary actor Toshiro Mifune as Toranaga, around whom the kingdom’s political constellation methodically arranges itself.

From Salon ● Feb. 27, 2024

The actors have costarred in two "Expendables" movies together.

From Salon ● Nov. 3, 2023

Zendaya, 25, and Holland, 26, have been romantically linked for years — pretty much since they costarred in 2017’s “Spider-Man: Homecoming” and gamely joked about the relationship rumors on Twitter.

From Los Angeles Times ● Jun. 15, 2022

The Conners As ABC’s “cast from the past” week continues, Dan Aykroyd, who costarred with this sitcom’s John Goodman in “Blues Brothers 2000,” puts in an appearance in this new episode.

From Los Angeles Times ● Oct. 7, 2019

You first came to prominence in the late '70s with two back-to-back ensemble films "Breaking Away," and "The Long Riders," the latter costarring your brother, Randy.

From Salon ● Mar. 15, 2023

Desi's rise — musician turned bandleader turned actor turned cofounder of a production company with a hit TV show costarring him — was objectively impressive, but for the senior Arnazes it wasn't enough.

From Salon ● Jan. 2, 2022

She made her first movie at 16 and graduated from teenage roles to costarring in the lavish musical productions there were a 20th-century Hollywood staple.

From Seattle Times ● Sep. 16, 2021

At the time, Plummer was costarring with Brian Dennehy in the Broadway revival of “Inherit the Wind,” the classic fictionalization of the Scopes monkey trial of the 1920s.

From Los Angeles Times ● Feb. 5, 2021

Courtney‘s future plans include a film with Lionsgate called “Jesus Revolution,” costarring Jim Gaffigan and set to begin production in 2021.

From Los Angeles Times ● Jul. 24, 2020

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