The term 'DRIVE MAD' can be broken down into four crossword solutions: UNHINGE (7 letters), DERANGE (7 letters), DEMENT (6 letters), and CRAZE (5 letters). UNHINGE means to cause someone to become mentally or emotionally unbalanced, while DERANGE means to throw into a state of confusion or disorder. DEMENT is an archaic term meaning to drive insane, and CRAZE means to cause someone to become wildly excited or enthusiastic. All of these words are related to the idea of driving someone mad, which is to make them lose their mental stability.