The side of a deal that hands over the money. Sometimes that side is you, spending what is yours; sometimes it is a person paid to be that side, week after week, for a shop or a factory.
Wiktionary gives the word as buy plus the agent suffix -er, the same -er that makes teacher and driver. So it literally names the one who buys.
Wiktionary 記的組成是 buy 加上表示「做這件事的人」的 -er，跟 teacher、driver 裡的是同一個字尾。所以這個字字面上就是「買的那個人」，這也正好解釋了為什麼它既能指一筆交易裡的買方，也能當成一份職稱。
Wiktionary (kaikki extract) entry 'buyer', etymology 'From buy + -er', source_ref kaikki:3f6f69a190036ae4:400844329:67615, supplied in the evidence packet
One branch
出錢的那一方，以及以此為業的人
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person who buys · noun · B1
The person who buys something, especially something big and expensive such as a house, a car or a business. The buyer is the side that pays; the seller is the side that hands the thing over.
買方、買家