Weaponize is a term used to describe the process of using something as a weapon. It is often used in the context of technology, such as when a computer virus is weaponized to cause damage to a system. The term can also be used more generally to refer to any kind of weaponization, such as when a country develops a new type of weapon. In this case, the crossword solution for the term WEAPONIZE is ARM, which stands for the military branch responsible for developing and deploying weapons.