交す
かわす · kawasu · JLPT N1 · verb-godan
to exchange
🤝 交 means cross, so 交わす = things cross back and forth between two people: exchange
The kanji 交 (kou) means cross or mutual. Items passing between two people in both directions is an exchange, so the verb is 交わす.
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.