The term 'FEVER FIT' is a combination of two crossword solutions, 'FEVER' and 'FIT'. FEVER is a medical condition characterized by an abnormally high body temperature, often accompanied by chills, sweating, headache, and fatigue. FIT is a state of physical health and well-being, usually achieved through exercise and proper nutrition. Together, the two terms can be used to describe a person who is in good physical health and has a strong immune system, which helps them to fight off illnesses such as FEVER.