The term 'OLD CURSE WORD' can be broken down into two crossword solutions: POX and FIE. POX is an old English word that was used to describe a contagious skin disease, such as smallpox. It is also used to refer to a curse or misfortune. FIE is an old English interjection that was used to express disapproval or contempt. It is also used to refer to a curse or bad luck. Together, these two words form an old curse word that expresses displeasure or contempt.