co-star Meaning in the Cambridge English Dictionary
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Meaning of “co-star” in the English Dictionary

"co-star" in British English

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co-starnoun [C]

uk   /ˈkəʊ.stɑːr/  us   /ˈkoʊ.stɑːr/
a ​famousactorappearing with another ​famousactor in a ​film or a ​play, when both have ​parts of ​equalimportance: 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 Learner’s Dictionary & Thesaurus © Cambridge University Press)
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