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an actor or actress who shares star billing with another; a performer whose status is slightly below that of a star: She is the costar of the film. (also co-star)
Not to be confused with:
coaster – a coasting sled or toboggan; a vessel engaged in coastal trade; a disk placed under an object to protect the surface below: Please place a coaster under your glass.
Abused, Confused, & Misused Words by Mary Embree Copyright © 2007, 2013 by Mary Embree
co·staralso co-star (kō′stär′)
A starring actor or actress given equal status with another or others in a play, film, or television series.
tr. & intr.v. co·starred, co·star·ring, co·stars
To act or present as a costar.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
or co-star(n. ˈkoʊˌstɑr; v. -ˈstɑr)
n., v. -starred, -star•ring. n.
1. a performer who shares star billing with another.
2. a performer whose status is slightly below that of a star.v.i.
3. to be or have billing as a costar.v.t.
4. to present or bill as a costar or costars.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.