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English definition of “co-star”

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co-star

noun [C] uk   /ˈkəʊ.stɑːr/ us    /ˈkoʊ.stɑːr/
a famous actor appearing with another famous actor in a film or a play, when both have parts of equal importance: The co-stars of "Casablanca" are Ingrid Bergman and Humphrey Bogart.

co-star

verb [I or T] uk   /ˈkəʊ.stɑːr/ us    /ˈkoʊ.stɑːr/ (-rr-)
to appear in a film or a play as a co-star: Katharine Hepburn co-starred with Spencer Tracy in many films.
(Definition of co-star from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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