Английский Этимологический словарь - case (1)

- "state of affairs," 13c., from O.Fr. cas "an event," from L. casus "a chance," lit. "a falling," from cas-, pp. stem of cadere "to fall," from PIE base *kad- "to fall." The notion being "that which falls" as "that which happens." Widespread extended senses in law, medicine, grammar, etc.