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English definition of “costar”

costar

noun [C]  /ˈkoʊˌstɑr/
a famous actor appearing with one or more other famous actors in a film or a play costar  /ˈkoʊˌstɑr, ˈkoʊˈstɑr/ verb [I/T] (-rr-) [I] Bergman and Bogart costarred in "Casablanca."
(Definition of costar noun from the Cambridge Academic Content Dictionary © Cambridge University Press)

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