subs. phr. (common).A small brougham.
1857. DICKENS, Little Dorrit, I. xxxiii. She drove into town for the purpose, in a one-horse carriage, irreverently called at that period of English history, a PILL-BOX.
2. (common).A soldiers cap.
3. (American).A revolver or gun. Also PILL-BOTTLE. See MEAT-IN-THE-POT.