problem child
1. A child who is prone to wild or disobedient behavior. I know it's hard to believe now that he's a successful lawyer, but Timmy was a total problem child and constantly got into trouble! Debbie just keeps misbehaving no matter what we do—do you have any suggestions for dealing with a problem child?
2. One aspect of a company that is not performing as well as others. At this point, our retail store has become such a problem child that management is probably going to close it down before it bankrupts us.
3. A product that requires a lot of attention and funding in order to be successful. I know you all see this book as a problem child, but I really do think that it can a bestseller with the right marketing approach.