The term 'BIG SUPPORTER' can be broken down into two crossword solutions: FAN (3 letters) and DCUP (4 letters). A FAN is someone who is enthusiastic about a particular person, team, or activity. They often show their support by attending events, wearing merchandise, and cheering on their favorite team or individual. A DCUP is a large cup or mug that is used to hold a large amount of liquid. It is often used for drinking beverages such as coffee, tea, or hot chocolate. Both of these terms can be used to describe someone who is a big supporter of something, whether it be a person, team, or activity.