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English definition of “co-star”

co-star

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