I. ˈfollow-up 1 BrE AmE adjective [only before noun]
done in order to find out more or do more about something ⇨ follow up :
a follow-up study on children and poverty
II. follow-up 2 BrE AmE noun
1 . [uncountable and countable] something that is done to make sure that earlier actions have been successful or effective ⇨ follow up :
preventative treatment and follow-up several weeks later
2 . [countable] a book, film, article etc that comes after another one that has the same subject or characters:
Spielberg says he’s planning to do a follow-up next year.
follow-up to
a follow-up to their hit album