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 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 Learner’s Dictionary & Thesaurus © Cambridge University Press)