noun
book reselling; secondhand book arbitrage
Refers to the practice of buying valuable secondhand books at low prices and reselling them for a profit, often through online marketplaces. The term is strongly associated with book arbitrage, though it can sometimes extend to other secondhand goods.
彼はせどりで生計を立てている。
He makes a living from book reselling.
古本の背取りは、知識と経験が必要だ。
Book arbitrage requires knowledge and experience.