传染
chuánrǎn · HSK 7
infect
🦠 chuan-RAN: a chain ran through the crowd, spreading the bug
传 means pass/transmit, 染 means dye/stain. Together: something that passes and stains everyone it touches — contagion. A stain that keeps spreading down the chain.
传 — person radical 亻 + 专 (zhuān)
Originally a phono-semantic compound: 亻 (person) gives the meaning 'to pass on' between people, while 専/专 supplied the sound. Early uses referred to relay stations and messengers carrying word from place to place, which broadened to today's senses of transmitting, spreading, and handing down (as in tradition or biography).
染 — water 氵 + nine 九 + wood 木
染 depicts the dyeing process: 氵 (water) for the dye liquid, 木 (wood) for plant-based dyestuffs, and 九 (nine) suggesting repeated dippings to deepen the color. Originally meaning 'to dye cloth,' it later extended to figurative senses like 'to be influenced' or 'to contract' (as in illness).