The word 蔓延 is a metaphorical compound formed by combining two characters with closely related meanings: 蔓 (màn), which refers to the tangled, creeping stems of vines or plants that spread out laterally, and 延 (yán), which means to extend, prolong, or stretch. Together, they create a vivid image of something, like vines, fire, emotions, or influence, spreading outwards in an uncontrolled, creeping, and continuous manner, extending its reach gradually and persistently across a space or domain.