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costar

or co-star

[noun koh-stahr; verb koh-stahr]
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noun
  1. a performer, especially an actor or actress, who shares star billing with another.
  2. a performer whose status is slightly below that of a star.
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verb (used without object), co·starred, co·star·ring.
  1. to share star billing with another performer.
  2. to receive billing of slightly less status than that of a star.
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verb (used with object), co·starred, co·star·ring.
  1. to present (two or more actors) as having equal billing or prominence.
  2. 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. 2018

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British Dictionary definitions for co-star

co-star

noun
  1. an actor who shares star billing with another
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verb -stars, -starring or -starred
  1. (intr often foll by with) to share star billing (with another actor)
  2. (tr) to present as sharing top billingthe film co-starred Mae West and W. C. Fields
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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

Word Origin and History for co-star

also costar, 1919 as a verb; 1926 as a noun, from co- + star (v.).

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Online Etymology Dictionary, © 2010 Douglas Harper