The crossword solution for the term 'RENDER IMMOBILE' is 'PARALYZE', which is an 8-letter word. To render someone or something immobile means to make them unable to move, and PARALYZE is a verb that means to cause someone or something to become unable to move or act. It can be used in a physical sense, such as when someone is paralyzed due to an injury or illness, or it can be used in a figurative sense, such as when someone is paralyzed with fear.