Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
co-star is a verb and noun meaning "feature as the co-star in a performance". It carries 3 recorded senses.
feature as the co-star in a performance
one of two actors who are given equal status as stars in a play or film
Definitions, synonyms and semantic relations for co-star come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.