Definition of "costarring" []

• Present participle of costar. (verb)

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• "Marvel Comics title costarring the spunky Kitty Pryde."
• "TV Guide Magazine: When you first found out you'd be costarring opposite Courteney Cox, how did you feel?"
• "After costarring in several films in 1956, Garner landed the role of Bret Maverick on the popular TV Western series Maverick (1957), where he remained until 1960."