交流
jiāoliú · HSK 3
exchange
🔄 交 (cross/hand over) + 流 (flow) = things flowing across between people
交 carries the sense of crossing or handing over (as in 交换 exchange), and 流 means flow or current (as in 流水 flowing water). Together: ideas, words, or goods flowing back and forth — an exchange or interchange.
交 — top 亠 + 父-like crossed legs
Originally a pictograph of a person standing with legs crossed, showing the idea of crossing or intersecting. From this concrete image, the meaning extended to abstract senses like 'exchange,' 'interact,' and 'hand over.' Modern uses such as 交流 (exchange) and 交通 (traffic) all trace back to this core notion of crossing.
流 — water radical 氵 + 㐬 (phonetic, child being born)
流 is a semantic-phonetic compound. The water radical 氵 gives the meaning, while 㐬 depicts an infant being born head-down with amniotic fluid, suggesting downward flow. Together they convey water flowing, and by extension 'to flow' or 'current'.