The word "动机" is formed by combining the character "动", meaning "to move" or "action", constructed from the radical "力" (force) and the component "云" (historically associated with movement), with the character "机", meaning "machine" or "mechanism", built from the radical "木" (wood) and the component "几" (denoting a framework). Together, these characters create a compound where "动" conveys action and "机" conveys cause, resulting in the meaning "motive" or the driving force behind an action.