The word "de-mobilizes" means to demilitarize or to disband military forces. The antonyms for this word are "mobilizes" or "militarizes." When a country mobilizes, it means that it is preparing for war or military action, while militarizing refers to the process of becoming more military-oriented. Other antonyms for demobilize could be "assemble," "gather," or "rally," which are all words that imply bringing together or organizing for a specific purpose. In the context of civilian life, the opposite of demobilizing could be "activating" or "energizing," meaning to begin a project or engage in a task with full force.