Dictionary.com

costar

or co-star

[ noun koh-stahr; verb koh-stahr ]
/ noun ˈkoʊˌstɑr; verb ˈkoʊˈstɑr /

noun

a performer, especially an actor or actress, who shares star billing with another.
a performer whose status is slightly below that of a star.

verb (used without object), co·starred, co·star·ring.

to share star billing with another performer.
to receive billing of slightly less status than that of a star.

verb (used with object), co·starred, co·star·ring.

to present (two or more actors) as having equal billing or prominence.
to present as having slightly less status than that of a star.

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Origin of costar

An Americanism dating back to 1915–20; co- + star
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

Example sentences from the Web for costar

British Dictionary definitions for costar

co-star

noun

an actor who shares star billing with another

verb -stars, -starring or -starred

(intr often foll by with) to share star billing (with another actor)
(tr) to present as sharing top billingthe film co-starred Mae West and W. C. Fields
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012