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Learner's Dictionary
costar
1 ENTRIES FOUND:
costar
(noun)
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costar
/
ˈ
koʊˌstɑɚ/
noun
plural
costars
costar
/
ˈ
koʊˌstɑɚ/
noun
plural
costars
Learner's definition of COSTAR
[
count
]
:
one of two or more main actors in a movie, television show, or play
the actress and her two
costars
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— costar
verb
costars
;
costarred
;
costarring
[
+ object
]
The film
costarred
Katharine Hepburn and Spencer Tracy.
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[
no object
]
He
costarred
in her most successful film.
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