買う
かう · kau · JLPT N5 · verb-godan
to buy
🛒💴 kau sounds like cow: you go to market to buy a cow
買 has 貝 (shell) at the bottom, and shells were ancient money, so the kanji itself says trade with currency. Pair that with the sound: kau is close to cow, the classic thing to buy at a market.