verb (used without object), co·starred, co·star·ring.
verb (used with object), co·starred, co·star·ring.
Examples from the Web for costar
During the filming of To Die For, Affleck shared an apartment in Toronto with his costar, Joaquin Phoenix.Casey Affleck, Star of ‘Out of the Furnace,’ on His Hollywood Struggles|Marlow Stern|December 2, 2013|DAILY BEAST
Wait… and Shailene, the star of that, is your costar in The Spectacular Now.Brie Larson On ‘Short Term 12,’ One of the Year’s Best Films|Marlow Stern|August 25, 2013|DAILY BEAST
Usher Monteith's onscreen romance with costar Lea Michele wasn't hard to fake: the two actors were dating in real life as well.
The two produced, co-wrote, and costar in Promised Land, the new drama out Friday.Matt Damon and John Krasinski Talk About Their Bromance, ‘Promised Land,’ and More|Kevin Fallon|December 26, 2012|DAILY BEAST
There was costar Jim Sturgess coming up to hug her, and there was Susan Sarandon giving the director a kiss on the cheek.The Wachowskis’ ‘Cloud Atlas’ Wows Toronto International Film Festival|Chris Lee|September 9, 2012|DAILY BEAST
Voiture and Costar frequently cite him as a model in their letters.A Philosophical Dictionary, Volume 10 (of 10)|Franois-Marie Arouet (AKA Voltaire)
A little of Costar's well-known exterminator would rid Mr. Aldrich of this rascal rodent.