co-star Meaning, definition in Cambridge English Dictionary
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Meaning of "co-star" - English Dictionary

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co-starnoun [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-starverb [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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