The word 阻击 is formed by combining the characters 阻 and 击, where 阻 means to block or obstruct, derived from the radical 阝 indicating terrain-related hindrance, and 击 means to strike or attack, originating from a pictograph representing a hand hitting with a tool. Together, they create a compound word where 阻 modifies 击 to convey the specific action of intercepting or ambushing by first obstructing and then attacking, typically used in military contexts to describe stopping an enemy advance through defensive offensive action.