What does co star mean?
Co star means (acting) A person who shares star billing with another..
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/ˈkəʊstɑː(ɹ)/ · noun
(acting) A person who shares star billing with another..
The once famous actor objected to his costar having a bigger dressing room.
Alas, always a costar but never a star.
People thought his career was over but now he will get to costar on Broadway next month.
Purchasing a snowplow transforms Homer into a new man. Mr. Burns' laziest employee suddenly becomes an ambitious self-starter who buys ad time on local television at 3:17 A.M^([sic]) (prime viewing hours, Homer gingerly volunteers, for everyone from alcoholics to the unemployable to garden-variety angry loners) and makes a homemade commercial costarring his family.
Use co star when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Co star means (acting) A person who shares star billing with another..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
The once famous actor objected to his costar having a bigger dressing room.
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