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."
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