A deal breaker is a term used to describe an issue or factor that is so important that it can cause a deal or agreement to fail. The two crossword solutions for the term deal breaker are NARCO (5 letters) and NARC (4 letters). NARCO stands for Narcotics and Dangerous Drugs Control, which is a branch of law enforcement that focuses on the control and regulation of narcotics and dangerous drugs. NARC stands for Narcotics Anonymous, which is a support group for people who are recovering from drug addiction.