co-star

noun

1. an actor who shares star billing with another

verb

1. introften foll bywith to share star billing (with another actor)
2. tr to present as sharing top billing

   the film co-starred Mae West and W. C. Fields

Example Sentences

After the actor shared his diagnosis with the world, Stamos took to Instagram to show his longtime co-star some love and appreciation in a series of photos and videos.

From Salon

“When you grow up in a place with that history, it’s your normal,” said Petticrew, in a Zoom call with Doupe, their co-star.

From Los Angeles Times

He’s also expecting a visit from his longtime co-star John Stamos later this week.

From Los Angeles Times

Next time, she was in Atlanta, rehearsing for a new Boots Riley film co-starring Demi Moore, about a group of shoplifters.

From Los Angeles Times

The present Queen was among Spencer's many fans, and as Duchess of Cornwall she invited the actress and her co-stars to Clarence House for a reception in 2021, marking the show's 70th anniversary.

From BBC