co-star Pronunciation: /ˈkəʊstɑː(r)/Translate co-star | into German | into Italian | into Spanish French translation of co-starA. n co-vedette (f)B. vtr a film co-starring X and Y = un film avec X et Yco-star in other Oxford dictionaries Definition of co-star in the British & World English dictionary Definition of co-star in the US English dictionary