Word Origin & History
brat
c.1505, slang, "beggar's child," originally northern, midlands and western England dialect "makeshift or ragged garment," probably the same word as O.E. bratt "cloak," from a Celtic source (cf. O.Ir. bratt "cloak, cloth"). The modern meaning is perhaps from notion of "child's apron." Bratty is first recorded 1961.