Etymology
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co-star

also costar, 1915 as a noun; 1916 as a verb; from co- + star (v.).

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Definitions of co-star
1
co-star (v.)
feature as the co-star in a performance;
co-star (v.)
be the co-star in a performance;
2
co-star (n.)
one of two actors who are given equal status as stars in a play or film;
From wordnet.princeton.edu