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Longman Dictionary of Contemporary English
co-star
I.noun
EXAMPLES FROM OTHER ENTRIES
▪ Hepburn was Humphrey Bogart's co-star in the movie 'African Queen'.
▪ Houston's co-star in "The Bodyguard" was Kevin Costner.
▪ Stan Laurel appeared in many comedies with his co-star Oliver Hardy.
EXAMPLES FROM CORPUS
▪ Andrew Faulds may have a co-star yet.
▪ Grant and co-star Julianne Moore provide only modest charm as the couple expecting their first baby.
▪ His first wife was his co-author and co-star of Fawlty Towers, Connie Booth.
▪ Neither Stone, her co-star William Baldwin or the rest of the cast were involved.
▪ Perhaps a different hat like the cowl co-star George Clooney will be wearing as the next Batman.
▪ Unlike her former co-star, Antonio Banderas, Abril has not been tamed by Hollywood.
II.verb
EXAMPLES FROM OTHER ENTRIES
▪ Annette Bening co-starred in movies such as 'Valmont', 'Postcards from the Edge' and 'Regarding Henry'.
▪ The movie co-stars Sarah Jessica Parker, Elle Macpherson and Ben Stiller.
EXAMPLES FROM CORPUS
▪ De Niro had to fight for him to co-star in GoodFellas, but that was the picture which changed it all.
▪ Easy Rider had not yet burgeoned when he cast Nicholson to co-star alongside Barbra Streisand.
▪ Last year Demi, who co-starred in Ghost, hired an amusement park for 37-year-old Bruce's big day.
▪ She co-starred in Share My Lettuce with Ken.
The Collaborative International Dictionary
co-star

co-star \co-star\ v. t. to feature as the co-star in a performance; as, the film co-starred Robin Williams as the psychiatrist.

co-star

co-star \co-star\ v. i. to be the co-star in a performance; as, Robin Williams co-starred in the film.

Douglas Harper's Etymology Dictionary
co-star

also costar, 1919 as a verb; 1926 as a noun, from co- + star (v.).

Wiktionary
co-star

n. (alternative spelling of costar English) vb. (alternative spelling of costar English)

WordNet
co-star
  1. n. one of two actors who are given equal status as stars in a play or film

  2. v. feature as the co-star in a performance

  3. be the co-star in a performance

  4. [also: co-starring, co-starred]

Usage examples of "co-star".

Hitchcock intended to end the film with Grant about to murder his co-star, Joan Fontainea daring, and audience-upsetting climax.

Like her three co-stars Mags is something of a television name by now.

Fingerhood, Jimmy, her co-star, her husband, the movie composer she screwed in desperation the night she lost the Oscar, the cameraman whose only interest was her labia minora which he said resembled a pink tea rose, the construction worker she picked up on a dare and was let down by with a bang, even the midgetthey all agreed she was a washout in bed.

In the fight scene proper, an anoraked Lorne Guyland is given the hiding of his life, despite the fact that he surprises his sleeping co-star with a car-tool.

Soon I sink into a dream with a familiar theme, co-starring Janet Thrush.

She said she had a co-starring role, and she showed around a viewfinder.

On the far side of Jay's table I saw the handsome face of Housemartin, his co-star in the Charlotte street film library.

And so were the animators and voice actors who created his co-stars.