HOMEBOUND is a term used to describe someone who is confined to their home due to illness, disability, or other personal reasons. It can also refer to someone who is unable to travel due to restrictions or limitations. The term is often used in the context of medical care, where a patient is unable to leave their home for treatment. In this case, the crossword solution for HOMEBOUND is INDOOR, which accurately describes the situation of someone who is unable to leave their home.