The word 乱跑 is formed by combining two characters: 乱, which conveys a sense of disorder, chaos, or recklessness, and 跑, which means to run. Their fusion creates a single, vivid concept where the quality of the action (乱) is directly fused with the action itself (跑), picturing a specific manner of movement, running around in a chaotic, undisciplined, or aimless way. It’s a direct conceptual blend, like painting "chaos" onto the verb "to run".