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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

Mirren and Brosnan are not the first to push back on the idea of Bond being played by a woman, with the sentiment echoed by Brosnan's Die Another Day costar, Halle Berry.

From BBC Aug. 17, 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

‘Conclave’ costars John Lithgow and Stanley Tucci can masticate the scenery with the best of them.

From Los Angeles Times Nov. 21, 2024

You also have interviews with Dunaway, but also her son, friends, writers/scholars and costars.

From Salon Jul. 15, 2024

A film like “The Taste of Things” gives something to viewers too, but it also seems to have given something back to its costars.

From Los Angeles Times Feb. 7, 2024

The actor doesn’t connect with the material or their costars.

From Salon Dec. 29, 2023

They napped in meadows and stood knee-deep in frigid streams, costars in their own private dog-food commercial.

From "Me Talk Pretty One Day" by David Sedaris

Stern uses 2021’s best-picture-winning “CODA,” which costarred Matlin, as a happy ending of sorts for her film, without denying the ongoing movement for greater Deaf visibility.

From Los Angeles Times Jun. 27, 2025

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

From Salon Nov. 3, 2023

They also costarred in a late-1990s story arc on the primetime medical soap “ER” in which she played a pathological liar faking her way as a doctor and was fixated on Edwards’ Dr. Mark Greene.

From Los Angeles Times Feb. 24, 2022

She had just completed directing "Waitress," a film she wrote and costarred in when she was slain; a few months later, it would premiere at the Sundance Film Festival.

From Salon Dec. 1, 2021

The longtime family home of the late Rose Marie, who costarred in “The Dick Van Dyke Show,” has come on the market in the Chisholm Estates neighborhood of Van Nuys at $1.049 million.

From Los Angeles Times Jul. 29, 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

“The Great Muppet Caper” Kermit and company find themselves in London in this 1981 franchise entry directed by Muppets creator Jim Henson and costarring John Cleese, Diana Rigg and the late Charles Grodin.

From Los Angeles Times Aug. 6, 2021

Stanley Tucci voices Bitsy Brandenham on Apple TV+'s animated musical series “Central Park,” cocreated by and costarring Josh Gad.

From Los Angeles Times Jul. 2, 2020

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