The term MEMORABLE LINE can be broken down into two crossword solutions: SCAR and ITSHARDTOFORGET. SCAR is a four-letter word that can refer to a physical mark left on the skin after a wound or burn has healed, or it can refer to an emotional mark left on a person after a traumatic experience. ITSHARDTOFORGET is a fifteen-letter phrase that suggests that something is so powerful or meaningful that it is difficult to forget. Together, these two solutions suggest a MEMORABLE LINE that is either a phrase or a saying that has been so impactful that it is hard to forget.