RATS ON is a phrase used to describe someone who is snitching or informing on someone else. The crossword solutions for this phrase are NARCS (5 letters), SNITCHES (8 letters), and SINGS (5 letters). NARCS is an acronym for Narcotics Officers, which are law enforcement officers who investigate drug-related crimes. SNITCHES is a slang term for someone who informs on another person, usually to gain favor with authorities. SINGS is a slang term for someone who gives information to the police, often in exchange for leniency.