The term 'Ratted (On)' can be summarized by two crossword solutions: 'FINKED' (6 letters) and 'TOLD' (4 letters). 'FINKED' is a slang term for informing on someone, usually to the authorities. It is derived from the Yiddish word 'fehken', which means to inform or to spy. 'TOLD' is a more general term meaning to communicate information to someone. Both terms refer to the act of revealing information about someone else, often in a negative way.