Other spellings change

Word parts change

co- + star

Pronunciation change

Noun change

Singular
costar

Plural
costars

  1. (countable) A costar is an actor who appears on-screen with other actors of equal importance.

Verb change

Plain form
costar

Third-person singular
costars

Past tense
costared

Past participle
costared

Present participle
costaring

  1. If an actor costars, they appear in a production as a costar.