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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:

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

When he recalls the moment he told Candy that Jim Belushi died in 1981, Candy’s “SCTV” costar Dave Thomas tearfully recalls his friend saying, “Oh God, it’s starting.”

From Salon Oct. 12, 2025

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

He could throw a tantrum or two until Jenny figured out what he wanted: Cha-Cha to costar in every episode!

From "Dog Squad" by Chris Grabenstein

Winona Ryder wishes her younger costars would share in her passion for cinema.

From Salon Aug. 30, 2024

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

From Salon Jul. 15, 2024

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

Upcoming: “Palm Royale” on Apple TV+, teased in the birthday special by costars Laura Dern, Kristen Wiig and Allison Janney.

From Los Angeles Times Apr. 26, 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

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

“Do the Right Thing” Spike Lee wrote, directed and costarred in this potent 1989 exploration of racial tensions in Brooklyn’s Bedford-Stuyvesant neighborhood.

From Los Angeles Times Jun. 11, 2021

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

Tony Ortega, a well-known Scientology critic, said in June 2020 that it was Danny Masterson who brought Prepon into Scientology in the late 1990s, when they were both costarring on the Fox sitcom.

From Los Angeles Times Aug. 17, 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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