The term PROS' FOES refers to the opponents of a group of people known as the 'pros'. The term is often used in sports and politics, where the pros are the team or party that is favored to win. The crossword solution for this term is ANTIS, which stands for 'anti-establishment' or 'anti-government'. This term is used to describe those who oppose the current government or system, and are actively working to change it.