From Longman Business Dictionaryproblem childˈproblem ˌchild noun (plural problem children) [countable usually singular]1COMMERCE a product or business that has financial problems, often one that its makers or owners do not know what to do withThe troubled company is widely regarded as the problem child in the group’s portfolio.2MARKETING a product with a low percentage of the total sales in a market that is growing quickly. Problem children are one of the four types of product in the GROWTH/SHARE MATRIX