To satisfy the requirements, to suit a purpose. This term originally came from the nineteenth-century American stage, where the posters announcing a program would list the star attractions and then add lesser-known entertainers to complete the show (or fill out the bill). By mid-century the term had been transferred to other areas, where it acquired a more primary sense of providing what was needed. Thus a political article in Harper’s Magazine in 1890 included the comment. “They filled the bill according to their lights.”