Costar
(verb)
To act as a co-star in a film or play.
Origin:
From co- + star.
Examples:
- She costarred in the hit movie with Tom Hanks.
- He costarred in the play with Meryl Streep.
- She costarred in the TV series for several seasons.
- He costarred in a number of successful films.
- She costarred in the award-winning play.