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co-star

noun [C]
 
 
/ˈkəʊ.stɑːr/ US  /ˈkoʊ.stɑːr/

Definition

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.Actors and performers
(Definition of co-star noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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