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English definition of “co-star”

co-star

verb
 
 
/kəʊˈstɑːr/ US  /ˈkəʊstɑːr/ (present participle co-starring, past tense and past participle co-starred)
FILM/PLAY [T] If a film, play, etc co-stars two or more famous actors, they are in it.Casting, roles and scripts
ACTOR [I] to be in a film, play, etc with another famous actor: Hugh Grant co-stars with Julia Roberts in 'Notting Hill'.Casting, roles and scripts
(Definition of co-star verb from the Cambridge Learners Dictionary © Cambridge University Press)
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