The definition of child labor is children who are put to work full-time when they are under the legal age or working illegally.
An example of child labor is a five-year-old working in a factory.
the regular, full-time employment of children under a legally defined age in factories, stores, offices, etc.: in the U.S., the minimum legal age under federal law is 16 (in hazardous occupations, 18)
The employment of children, particularly under terms and conditions considered inhumane or prohibited by law.