Meaning of “costar” in the English Dictionary

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"costar" in American English

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costarnoun [ C ]

us /ˈkoʊˌstɑr/

a famous actor appearing with one or more other famous actors in a film or a play

costar
verb [ I/T ] us /ˈkoʊˌstɑr, ˈkoʊˈstɑr/ -rr-

[ I ] Bergman and Bogart costarred in "Casablanca."

(Definition of “costar” from the Cambridge Academic Content Dictionary © Cambridge University Press)