One or more unpleasant tasks, assignments, or employment duties, especially those of a disreputable or illicit nature.
The belief that the world is ruled by a pair of antagonistic forces, such as good and evil; the belief that man has two basic natures, the physical and the spiritual.
Duality; the condition of being double.
The view that the world consists of, or is explicable in terms of, two fundamental principles, such as mind and matter or good and evil.